Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c35df18793b4afe…

MALICIOUS

PDF

84.8 KB Created: 2021-10-06 04:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 568329f65ceb3d9365bc5d44e59519e1 SHA-1: 09942e4c1f89a3576025601584124154f3a184eb SHA-256: 3c35df18793b4afeaf78f791df0cdd35cf12b18e02d6552fe2a8173240d299e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=singing+to+your+plants PDF link annotation
    • http://oldmotorsclub.com/files/file/kitetuxiridogalejadesit.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/rilugimavodi.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/26760205297.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/90965853956.pdfIn PDF document text
    • http://balone.net/_upload/file///67186277931.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/87885749869.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/zenigezi.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/53963472036.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/94468374211.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/2346367663.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/22150684898.pdfIn PDF document text
    • http://www.pvvc.cz/files/fipujesufojujut.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ded127c15078ddd96b4b7aac52b32047/vujekixofadativolonaxer.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615afc35aba4a---96839495342.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wimojun.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/valogawoge.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/h6s8t6n8donc9t32mpnfp6irds/35005417280.pdfIn PDF document text
    • http://24cvety.ru/upload/files/nupagurogukeko.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/vurerefol.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44919491968.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/23276367712.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/61315658676.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/81817329848.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/83604019541.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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 18776 bytes
SHA-256: 87ec3b628174af578cea7b04681e4425c252f93dec3bf1a43eacb3cb577f3957
font_01_sfnt_off0001159f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 10584 bytes
SHA-256: fb94bb8ac31f3329a6a471c2ba263645da86a6aade0edc16ef82412de97c4227

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