Malicious PDF — malware analysis report

Static analysis result for SHA-256 954903878906d406…

MALICIOUS

PDF

85.4 KB Created: 2021-08-03 00:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b5d694fff487938de7b645e383575860 SHA-1: 3e86966fd3a471c8ff415a8612c1836e7968586a SHA-256: 954903878906d406ee02a1cf3c4253691d8337c9488d17ff6ccc176b598b7867
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kamnitikamini.si/upload/files/20649887837.pdf In PDF document text
    • http://armanetti.com/images/14038950031.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/69272365088.pdfIn PDF document text
    • http://e-district.org/userfiles/file/metabikuponatureginaga.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/73295393693.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/zajural.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/noxizetisa.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/vomupefavo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b758e567---62851268988.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/fewesolokerabir.pdfIn PDF document text
    • https://kermanrooz.com/img/files/35231806222.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e25fd097510---53105314107.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/54344637610.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ee5204d2d---7795673010.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/vokixisenusoridopitivod.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/67964122895.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/26029685221.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b46ef916---13395259082.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/lemujolamuxu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10395006208.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b3f2e3c2212769980cf614ab6abf64dd/xumobejugibevuj.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/fubiruzowetum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+flu+full+movie+2013+english+subtitles+youtubePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 17596 bytes
SHA-256: 844fdabaa97dc183df5c32f101513b4d6a5390e63b546a7977ae970030844b81
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_03_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 11248 bytes
SHA-256: 5d363de2ccc461f52621f6ac228c73773022cb053f5bace58d7cf658e3f7f380

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