Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b7f2bf502ab0d9…

MALICIOUS

PDF

96.0 KB Created: 2021-07-15 13:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4e496e7d13090002f56372a91980dad SHA-1: f2acf7f6f4806e8b990d69500b7ee8a8f40556ef SHA-256: 74b7f2bf502ab0d96e1fc31b8ded7db53743ce4387ea40047cb13352bd191bd3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on potentially disposable hosting suggests an attempt to obscure the final malicious destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uq5q7q8j5q8d7gopif7u3j21n5/6433764050.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910e7f7d1f1---70128150506.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/c281a732119a6319edb0a475fad31359/60314444338.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/631mnvf4msn1ircfrktf9miri1/59700374263.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/835ab9e23db03a7db644cc74c42ce72e/85902241586.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205c532675---89595804669.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8e35d14ad137120372c07c86baa774c0/15406578348.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabbc4dc50---gajazerubu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af13e4019---noderixoxuza.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f3rot0c6elkc74bt1m925dh9m8/xoxolilifewilapakukojo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/fozozupewuwobolig.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4f60546132d61363cf11452e78cf799d/82930383746.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/riwekugixoxe.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kikatanuvo.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/6772939911.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44797254286.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d74ad6f0---67084208739.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85c8470f79---rumabuwuwaxininiwidisub.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/81690095718.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i7m96rfdvugugt33l44o187ma6/77622107396.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bab002e7161---dofixarubasidewibiz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3be6e261---tajotiwaleposogo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981f4ed---54198293791.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607125d056596---53309325731.pdfIn PDF document text
    • https://susta.vn/userfiles/file/8169238960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=elephants+and+their+youngPDF 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_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 10868 bytes
SHA-256: a43c16940c54c2db589a02cb3bed00c6e7f82fe87e2d01efcd2406246189757b
font_01_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 16764 bytes
SHA-256: 4e59f65eb40d4bbf18e0fbc733257c1af86c76bb24b03b35b97aeecb6d61f73f