Malicious PDF — malware analysis report

Static analysis result for SHA-256 98005dee782e703c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 17:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcba30e2751844c474cf5fec77d85bd6 SHA-1: 9bae85d203f41bde3dac94d7ae00e45a1e9022cd SHA-256: 98005dee782e703cdfca8091ce8d6d0ffa2e39babd1c2b1e5d0c7a382784ea79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external PDF documents hosted on various websites, many of which appear to be compromised. The high number of distinct hosts and the nature of the links suggest a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://braus.uz/images/shared/file/61996509290.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zukubomumasebejub.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/34088242526.pdfIn PDF document text
    • https://signika.pl/Upload/file/44622125885.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/46126940732.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4drbl5e47kg3ifi0tujsaujeh6/22061830165.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/96338033986.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/622102359.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sooki09jfdsgmffff34c47qsk4/71138400094.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b961a9086---zotovakilujadukorugov.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/50262682271.pdfIn PDF document text
    • https://mauspro.net/upload/files/nuzaluxiripuxirifafite.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ec9e8212---zopetuwidesu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff0bc6a0cc---japapekofasepinubefokomos.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161234a4d235ce---nefirevamimulirijegudifo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/13339526063.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161000c6519bf2---18088950589.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/58669743467.pdfIn PDF document text
    • https://geniodelweb.com/file/59481104259.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16114b8a7d9524---gopakegowe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5254543f832b180fe7a16b0adb094d72/vowezoxunafub.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/vipanututalisib.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd01c98877---zedex.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/modixizawokokizova.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/66528795356.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a3634c0b8b5312f624ee97c20ac2209e/timab.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/27430850413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=not+to+exceed+quotePDF 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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 10016 bytes
SHA-256: b49bafc07fce40e5c7f79d8710d26806b88857fe08f365550688ff23b36074f3
font_01_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 17188 bytes
SHA-256: 9fcfe1ae9a3c890a95f9282a43165b8afb3c050a38ce51d0a5b302d2c4f91d6b

Open this report in the interactive analyzer, or submit your own file for analysis.