Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5987cfebdcd6c7b…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 15:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c324d9c22e7144ac2182a898bc74b95 SHA-1: 4e6c983dce4a078ed2bec75d28d44c1be2d9e843 SHA-256: b5987cfebdcd6c7b65da6d4a3a372e049145b55b41ea96b444677a3463dc1176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=pagemaker+converter+to+pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebee5390bc---jufemiredepadubozet.pdf
    • http://c-amc.com/upload/files/tetixamapulupokodamoz.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50374e4cd---siburoxedakowaridu.pdf
    • http://alliusie.com/userfiles/file/50826430792.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3b5da0ea---72532949844.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/bemorugunozikawalev.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f03a60d983b0a776372d0fdd07d75347/razorelexavapogarexu.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921fdcb3139---9435025588.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7d750c7b---44228592973.pdf
    • http://aceonlinementors.com/userfiles/file/vitixopuwabawezux.pdf
    • http://agcslohian.com/userfiles/file/19516025373.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/kutokavelon.pdf
    • http://citescolairedeledit.com/include/file/53615501747.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/l3a3niosend24865ufr3r65u84/3133070725.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210627_7DD2252B6F88102B.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6e0b90774726366b146ddab1f9653c7/javubupixov.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d7j284f64289ntt5v7cjdfkcg0/77193075225.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/4790883861.pdf
    • http://liburnia.pl/userfiles/file/vujeperavabalulexebemu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/58d71c625ada0ad6916a33dd8538bce6/19395979167.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/29389692548.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03310420fd---bigijalef.pdf
    • 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_off0000e92c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
font_01_sfnt_off00010143.bin
8739cc9d599058e262d9e08edca1aa4059615ae4bc9a14dcaee07ada3025eefe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 10816 bytes
font_02_sfnt_off00011a0a.bin
11dc406da839b92325cc28275e2a3f801bcbaefc0a2d6df5c8d57ad6585a5bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 17316 bytes