Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c3126553dcd36b…

MALICIOUS

PDF

82.8 KB Created: 2021-07-13 02:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edebe5491ef7f40f14aec3c42dc23866 SHA-1: 48feda1455362b1c6560f35419a10b69e2c6f46b SHA-256: b6c3126553dcd36b11bed2f62a42491bfe55b90e0c54abcfe987ffdfb86b4e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=stay+with+me+chords+angus+and+julia+stone PDF link annotation
    • http://nadiadsa.org/userfiles/file/34163549003.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210627_93C658556F3FD168.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/liwes.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/747cc4a81c8410c3ae0842a400bad3c5/26237036085.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091187449a0a---fetitozogagetub.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff3d274aa1---51615270712.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36a1951c1---14011712616.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/dogodulano.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/61215738285.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sulepibijufizijanur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fb833e7---25378935926.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/46071244737.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/10849230052.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/580b080d3b6df649921e643c7d53393d/11908884205.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/69547323787.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l2s3tm8lrm6lebgg2ls499e61q/tivurubiwefaret.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b659d5d4b---75581528859.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/97961911416.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9bb816e959417fac8b4235f7cafb85dc/bogojabazatela.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/63fe4af4f078a70172d0d1f7e00163ce/kedavarufuzokabom.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b3182a4e---zetowitunodozo.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/gefagopuwitumijasarewaz.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bda0ad50dbfe45334634a8cdcc094bf2/vamaf.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_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 18076 bytes
SHA-256: 191e10199f327cee9b648e54c2a6ca76495395325cfd9ec5c52fc3afcd04399f
font_02_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 11320 bytes
SHA-256: 47070911b71723f76ed8f163e6e07189f5597940b538bc42d8118143933d2c17

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