Malicious PDF — malware analysis report

Static analysis result for SHA-256 8442c910ba73311e…

MALICIOUS

PDF

99.0 KB Created: 2021-09-01 01:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd1196a1003445b2465dc3e58c0adeaa SHA-1: 0547bab158661c60acc390b7e7f9737929343707 SHA-256: 8442c910ba73311e41a0ab1cebf796f2841ea7e4cb0194d5525591832475af6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://fiberglasssupplydepot.com/userfiles/file/zewupiwojo.pdf In PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983da5965db---29431277143.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e591648a---pugonuwuxumijufumejeb.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/xekubidim.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdec8896e2---vojojunatokakonizuzut.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/7295587595.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/movibiruzaku.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobolovewokeguta.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/22f6f6ccee1a2e70f08709abf739cf63/tawekatakede.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/44214521825.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/vemerisakibiwafivupapa.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/suxutejatetofep.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7364d1826158b7c2178a33dc52f60c2e/11930351563.pdfIn PDF document text
    • http://remobudostol.pl/pliki/dozufuvezurijutiwopugovol.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/bogenovulimatis.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/4549418935.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dakexinul.pdfIn PDF document text
    • https://slide-bearing.com/d/files/nipipagorinix.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/15191511335.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ilhntsq859v0l98q99kae4a10e/45999194530.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/rosapolip.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd10a9f610---nudowabogunaregevemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=objects+beginning+with+tPDF 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_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 18692 bytes
SHA-256: e8f0cd470059471cfd8b2451a5b38cf1f389bc6d14a2b2830ff135de8c9b68df
font_01_sfnt_off00014eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECA 10464 bytes
SHA-256: 9e06250b1e703541fd85ac48c79b0cd5140afb7356103b0bd6b363c589f680d3
font_02_sfnt_off00016692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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