Malicious PDF — malware analysis report

Static analysis result for SHA-256 5956a338483470da…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 21:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa4078d0c441c87a1bde4b821f18d4bf SHA-1: a2d50393661ff00628520812b371b418e8c6fe32 SHA-256: 5956a338483470da35d9e19c13b7029b8d1c65b421d5e385a6bd2428962ba884
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fontanarosaserigrafia.it/userfiles/file/76680410478.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082156f45877---gubowuwuvonezoxoju.pdf
    • http://worthingtonpark101.com/userimages/28895597461.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/di6e1q7qenkskgkbg5kljn4dhv/90649847148.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa149f80df6---pazuweperokime.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/binukef.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gn9onrvsp48ulmia0ia10b0ukt/64684693761.pdf
    • http://amoy-art.com/Upload/file/63880783408.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6cc7e16984587754b7409980d4751e9a/93133507022.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4af8ee2b---7479517282.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2e8744e2---leteruxotonawoziram.pdf
    • http://phayaotechno.com/UserFiles/File/waweganikaxerisirikutid.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5660986a---64814972007.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ikd4s1g1nqgln559dv3ob52u5/21278320139.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6112afd9---pitafu.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/92349084449.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd9fe8a06---93461145588.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3400d42f4d1a106c78b2f1dee839e328/48219007649.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1f1ea71e301cd1379d36292a640c0491/relogi.pdf
    • http://minutemen-jrotc.com/clients/84940/File/95859277114.pdf
    • http://dnepropress.net/files/file/64143211535.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4bb39c6b---soluro.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b332db8a613---kizimozadafeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mesothelioma+and+lung+cancer
    • 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_off0000e6bf.bin
1bf63c30ddbb8f02719b499806f72b1585d8154dd175b8a40ebc28b0fc04ebc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 16592 bytes
font_01_sfnt_off00011202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 16792 bytes
font_02_sfnt_off00012a19.bin
9fc2cb07673ea48ab3c5dad890d43d01f52c80a35151c3dd3cff8d77cd4ebb7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 10912 bytes