Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5447a89c3f0574…

MALICIOUS

PDF

91.3 KB Created: 2021-07-26 23:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e97953bae87660741b7155ab4f0147e SHA-1: 0f336ac5bebcb6f5c6bbe0ecf990f4cb4456d94e SHA-256: 5e5447a89c3f05743f2dee242af7f109db17844bf6eef5d8c4ff070af6bf6691
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains multiple links to external resources, many of which are hosted on compromised websites or disposable domains. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to trick the user into downloading further malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7a5b5d189---kilowiziwugikenoxofel.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aae0e2627---86484412028.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517111147685353.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/vofufabef.pdfIn PDF document text
    • https://invest.pl/userfiles/file/rofumabi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109ba05cdd---dirulibujokutafevo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1e734cff---munimusasixagi.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/vuxekekuzaxowutijazowifi.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6583f1ec3---4104579939.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/99708140844.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/10a56d493b30f8a966ce2eee02ac387e/59934202774.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a4b1dd09---39944057378.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1950d4b1---pufigigunanegubunukol.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210528233513.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/26543659750.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/a8utdpfnl8l12h3iid4h7n33mg/50386583379.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/59002290629.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043010541963.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be901d3565e---44571896534.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/de72318ccd9e56e8333f93d6e143aae1/giwigi.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/44932767072.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/zasoti.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/wadaxegizu.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/33243338932.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c902b71b28---83516679412.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cl15dkonukputg5jgvd0m7r4db/kawetufulibevil.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3f501d1b37b715c81f65491cbaef316a/watorexedenuzodunulos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reset+epson+l1300+ink+pad+counterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 18124 bytes
SHA-256: b8f0c27178a3235e47f5ad55e63549b9249fd3fa77ca9bb71813e1ee50f643fe
font_01_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 11120 bytes
SHA-256: 87798b6f786713fdbb63454fbf322176488b822c5cc60eda8e21b19476b03cf3
font_02_sfnt_off000145b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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