Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf7620fab0a470a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 07:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71d1b05c3d9db9129da565de4bbae5c8 SHA-1: dbe7326e8a04e5641af9abf7b21e2839f73e5292 SHA-256: fcf7620fab0a470ab0850e347c4421ca2b92153941c56cc19f36c222baa0c4fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and other domains that appear to be part of a link farm. These links likely serve as a distribution mechanism for further malicious content or phishing pages, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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 http://alliusie.com/userfiles/file/vetiravudokukusovu.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba2c309a1---57637332207.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bukid.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/87826c6841d6c5c250668f08cb8a15e5/70999606900.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/63f5e47117607ccfc55d740aba1d342e/wopazowolikated.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/xelirimenitejinuve.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33640c9227---57420335219.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/memalesovulog.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022b809866---97915905757.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/kaxumososed.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mm31jfpe2g968dbqjq4vfk1n9n/31804139880.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/77733899829.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/57324678703.pdfIn PDF document text
    • http://e-menu.hu/editor_up/55441825776.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/tuxobopudopofur.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bufotaloweja.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/zaxedidupuzumov.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/wuzesuvapekafozav.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/zegelerolimasirenunodi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/doponipakola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=extracting+images+from+pdf+filesPDF 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_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 17132 bytes
SHA-256: 5aca161b0497ec20fb4b5c672a62f9feb50e03602768a8a55282665f8379dead
font_02_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 11048 bytes
SHA-256: fbe54851bc6c4e42df80222dc02cea418342221f3a53909e3e661c6d27fba906

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