Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b3a7e12c844142…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 18:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcb5852e61b8eb841e1ab1a28da9e94b SHA-1: c66f0277e6d50f525b77cc07b13b33198ac09a29 SHA-256: d5b3a7e12c8441428898aa7c4c0c9a4aa3abfb931bd1dff2d7a9e5cc403fd025
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO poisoning. The document body is unreadable, but the presence of multiple external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ownlines.com/upfiles/file/48951688612.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/kogozaletetunikagojis.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b542b1b6bdb1f7eaf1e000f77a6350e8/wenane.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/90686103832.pdf
    • http://netart.hu/userfiles/file/24180403340.pdf
    • https://lionkingbali.com/uploads/file/xabametabilafusibiwile.pdf
    • https://tepihtrava.rs/files/11935315835.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dcd78c1b---68191130189.pdf
    • http://telecycling.org/files/file/fusegede.pdf
    • http://skiflogistics.ru/userfiles/file/nokusiforiroti.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hiqu0f3urdatflerbg5v8so0s3/sepofipirotipeme.pdf
    • http://eros-arena.com/eros/userfiles/file/goneg.pdf
    • http://tetrafluoro.com/upload/files/wokuju.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/72223717893.pdf
    • https://xyoaa.org/sites/default/files/files/4379575635.pdf
    • http://canoto.us/Images_upload/files/dazosidosevuranuvulaz.pdf
    • https://www.sudicobank.com/ckfinder/userfiles/files/70513003811.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/sigoxun.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/72019260308.pdf
    • http://budka39.ru/files/susopixozezetupanikug.pdf
    • http://studiomuraca.eu/userfiles/files/74523287716.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=airxonix+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
font_01_sfnt_off0001006f.bin
323a5bd38a7d563b17b42023f02185a869c48b532f70c9bbbbc4f3c9fcbbbcf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 17420 bytes
font_02_sfnt_off00012d9a.bin
ece33ac1af7b314b80365eddd9f8c7725f6c9f01ae70cac3f912879577dcd883
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 9984 bytes