Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6231e688449127…

MALICIOUS

PDF

81.4 KB Created: 2021-08-08 19:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 12317b5b73a23ad0d1ebc104fb5f1bec SHA-1: 9004714d59ab6da2dc39756f6732471c95ea5588 SHA-256: 6d6231e688449127ee7ca3492f168f7f8905a1581b1e6ffc9884ee8c6dfc26cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, pointing to numerous distinct domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious or phishing sites, likely exploiting vulnerabilities or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608150c099891---27602811791.pdf In PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/gibojumudanenetabekozu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/xixesini.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jelebulozowuxesogexo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e1f0e005---78465277746.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/79043388856.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c6a8df07a6b2b2d2ef963077eadd58fd/47213599814.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/64379489483.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c141e9d047c---nuvemavej.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/2314009468.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cccfa8d38ba7271361708783699b23e5/jiwezutifuduzejut.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/febulutaloxajedexoselakam.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vc24j3p5pqmd13u9beuh8ik9d5/34380866500.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71484230054.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/51762974297.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/davujudevalibukimevorim.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d3b4e23e8b5e1c9d6acfc025182eea49/vowebarisani.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74379b4ee9---dugunaxezab.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb99bed4d5---31533052548.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9bb8u5lmmek8nddlk7qastkhts/17554572972.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/98539373863.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/gares.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/kewazikomexiretug.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ucq50d3knhv910q7pnoo1104g0/86420586770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=galvalume+sheet+standard+sizePDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16528 bytes
SHA-256: 2e62089b682d3f4e1df900a30108760ca3ab713b4ccfa17f95506f5b46a6325b
font_01_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 10656 bytes
SHA-256: f18f1f4eeeed26c869093c048425afa3ef6e443d1176db2f554daa761e7d1fde

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