Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f118df4de4270…

MALICIOUS

PDF

102.5 KB Created: 2021-09-04 15:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e39ce32a2de40edaefbf7442ae959a4 SHA-1: 504cf67795cef146b5ddd77d509bda39cf094483 SHA-256: 311f118df4de42700d4a0e2e7c111af59d4b02ba334c58b258c96a404a6287b0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to host and distribute a second-stage payload. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ferdavagnar.is/images/fck/file/63412772155.pdf In PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zobepagumol.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10e0f0fb5---nowoze.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c129b47d589---xogajud.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210901_013216.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/84663848601.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ghpi3v7mg9n17prdu031lo3r95/refovokupukojugamo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2c9c924b---wudipomonuvamiwejuragejuf.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/83439819345.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wunazowogelujuweribotobeg.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c5a53f4030d1bd438c6a1362844c73ea/49957424522.pdfIn PDF document text
    • https://p87.hu/files/pixuzijovojofu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7fe741da8fcaf19c5f417e15a17095d2/ledewexusume.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16082969e7e6bb---xowewid.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/zigorax.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jonujijevaxogizofi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55356bc7618efffc05087fd2a76d325a/36631917967.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/samumodaxofala.pdfIn PDF document text
    • https://beaszemin.com/files/tisilaf.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/5543176256.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/89520450030.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29d99a5e3---demoronofogudumarawuzon.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/43506155873.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/elc9hdps1mo84rbou4nctdn1ek/xidezegivekamajenawafeliw.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091531e9596c---fofipanafujilidemoxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sword+art+online+18+alicization+exploding+english+pdf+downloadPDF 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_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 11480 bytes
SHA-256: b87458917dbc66f922f215be13192b8183e318b8567c772d12072a175ae72eff
font_01_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 19260 bytes
SHA-256: 37cb05cb759c097f5c47d6014ba69d5411c08fc06a5907668a34de932c3aaa54
font_02_sfnt_off000173c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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