Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17fa5be22087a70…

MALICIOUS

PDF

70.1 KB Created: 2021-09-02 01:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28f0a4610dbc02dc301a6994902ac9a8 SHA-1: 3041017a8ae52d597cd740b30ee4d1af69b33159 SHA-256: a17fa5be22087a70f51ff6b02a0748ca2c07288fa9569fb90ce2a91a7e4ad938
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/95464341980.pdf In PDF document text
    • http://vdavloeren.be/userfiles/files/72596835506.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/wupixixarabufovelifekojaj.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dce82046---fojiwujepemiko.pdfIn PDF document text
    • http://farmina.ru/uploads/files/6098908447.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/49167980197.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/90280926178.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/fubikoxexir.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ec39580f---38953525660.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/mlbr3l0ht4q64g0i1nkt8s33i3/danelepoporetasub.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210828000809.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/69504590391.pdfIn PDF document text
    • https://datajournonepal.org/files/xivivoxekumanativuwu.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/12804422969.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pmpj0tubmju4f2mv7av5djee2p/zopuxerekipaselaf.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/dututedupenibipukomoxexu.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/39844095064.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202181143543729.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/60836679971.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mivolemenaremoji.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021627451521297.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/kawupav.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/67853518852.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/razukibotejitawamala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=example+of+turgidityPDF 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_off0000b72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 10868 bytes
SHA-256: fec492f90bd28b931171a3d156c8d8048968c33414eedb3cf9aebcddb95107cc
font_01_sfnt_off0000d015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 13884 bytes
SHA-256: cd452e2a9fa716bd3545089c6127e071b4510544f6d546dafee0a934136c002c
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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