Malicious PDF — malware analysis report

Static analysis result for SHA-256 421bbd9f28354a90…

MALICIOUS

PDF

100.6 KB Created: 2021-06-10 17:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37bbf08a8f57ffb1aa16e7083943e75c SHA-1: 324700653b720e3150fcf587809abba698e4ec50 SHA-256: 421bbd9f28354a90a25c1408fadbb83a26a2fa8b11f96840941a372e2e38d314
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The embedded URLs and the heuristic firings strongly suggest an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=taki+taki+audio+song
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9ffa9702556bcf21f8619bc7c719e662/nigirirokenez.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/nekomowawesojepogikefiri.pdf
    • http://royalwedding.jp/images/blog//file/pezokavoguzovem.pdf
    • http://indago-rovigo.it/userfiles/files/wagixamibipijarafamugav.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a88ff052bb408925301f045a7f9782f1/89877301783.pdf
    • http://bjbtrh.com/files/pic/file/xaxesewobojek.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/birizasolon.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8af1ef0843e6309ae3e7c543479d5b57/sazepesopabi.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070515bf032d---movurilukavugivupi.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a27e7074---watupuzopokatijakoze.pdf
    • https://adtw1.com/ckfinder/userfiles/files/33594591515.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070623605865---94895531649.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ef18acf9---90136404513.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfd585e5c---lepujawefu.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff1c1be79---jularurofapila.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e64e54960b37e6679e38f112e8473f14/3346050899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bb6.bin
2b7549807c569018153fa3f160223bb88dec8a915a09b2644a92a6acae376204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 4640 bytes
font_01_sfnt_off00014b86.bin
d65755c97fc008acbb8875c80e774d083bb1ec65890c5a7de9e65fe6db905a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B86 14688 bytes
font_02_sfnt_off00017760.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17760 4324 bytes

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