Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5cae43cfa97e28…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 16:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e8d5ce70360b020c3aba7e2ba07e146 SHA-1: 424f37395823c8ade1855bbab81141eb5b79687e SHA-256: db5cae43cfa97e28057ae7d57543028e4a864a279b5b6073bbeb95832ce66d87
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many hosted on compromised or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nikosdimos.gr/userfiles/file/28235957435.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/47962647599.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/menobelizugiberelowojo.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/53091724459.pdfIn PDF document text
    • http://screen.by/images/file/33293209406.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745a147368e---31657347440.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abe561562f8---60391438168.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac445968c5e---59284685588.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/jipajifejal.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e4587fbc9bd489d489e7bc0c87edefe0/40925648694.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/54bsspltq9mvqepd2k74rvqqvs/80081739006.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/wadus.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ci6c3k6t7p1e8v3r4qivh2vmdl/nipezukusuxosubifepopos.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5f998b9b---6311347439.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/71084131483.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28ea0795e---92377296846.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e06c89f3---laxisufuxefibajaxaxoreru.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877b9863acb---30345204612.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5520fd206b---53662912050.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q7eoij6jo855smgbmd208a6660/68549335953.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/6452252152.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/rajiwesisezimosirotepifa.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d8be37657894ade2ee3077f682efd36e/wizesijunukematutedo.pdfIn PDF document text
    • https://majubesar.info/contents//files/rijafitejopuzulipobowux.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50d979002---29344911298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+constructivist+perspectivePDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/revuwob.pdfIn PDF document text
    • 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_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 16872 bytes
SHA-256: 534d11ab3bd788ab063cf6bd294f8cd682963059180bd9c9884ec7c4c801fda7
font_02_sfnt_off00014409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14409 10392 bytes
SHA-256: 8477a1a464b34240f7cd2c5822815a8cce0a7344bf74d3ec850d1a3b72da0553

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