Malicious PDF — malware analysis report

Static analysis result for SHA-256 335a8b5a917a0988…

MALICIOUS

PDF

96.2 KB Created: 2021-07-24 21:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f891939a236fcb17d346950ffbb080f SHA-1: 1d6c12d41fc103fc371f41ebe5c4abd18359daba SHA-256: 335a8b5a917a0988e45c91ca2a7a8f9b1efcbea99284bdd0ee2ccd61680f7246
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/beeb583ac515318b7b60de19eeeb617c/41104794309.pdf In PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/20133859596.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a3200d6c---98639201072.pdfIn PDF document text
    • http://allasclub.com/campannas/file/seruxarojiwafok.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/41028379027.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/o9t0q998e21f8q9uk2qqtured9/wojufizoxirefagalajet.pdfIn PDF document text
    • http://web68s.com/upload/files/95112050818.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/2944561824.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/kifup.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/wodamalenokulu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6aa64fcd---17819257169.pdfIn PDF document text
    • http://groupkaishan.com/d/files/40257715886.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ear390mpqksqhd0qi3762j3jln/47401910728.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d96831cb3e537c8d9b2f14cc46717b82/63155376551.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/681fd278a937277959758fee91adfa7e/94001920140.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d3b2951e19611cfb5291c2aec7dc2374/48933953273.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/baninumo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/53326351069.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b3a161cd62e5cc68096b73a31460f997/87899728532.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1069366c---dazosupuwe.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb02d94253f9efffd7e8bcd2b500cb47/vilidumosagexu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/50278717842.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609223b10ab1b---xofik.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/nazerumuxogomorom.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/2423586466.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0c5c890f---74094274412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cambridge+english+empower+a2+progress+test+1PDF 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_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 21472 bytes
SHA-256: e4f3831d72bbe0e5e3026770daf1fbbea59dc82a36855c07865f56de3141c028
font_01_sfnt_off000140aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 11268 bytes
SHA-256: dd1e13244ea0e405bbcad65e2eb82e8ddccfbe85b48e715500bd530a0f9e8f65
font_02_sfnt_off00015a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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