Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a016cc2810c852…

MALICIOUS

PDF

76.1 KB Created: 2021-07-04 14:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c755f8e0df39e4385ffaa240d000b43d SHA-1: ce416caa96551d255ab1ce761bbfa52a8c329a3d SHA-256: d4a016cc2810c852a93b41af12a80b19499466b564e25f096694428336b721e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=last+drive+in+episodes
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kmp66u7ibshn4obsk02bjlsn9i/dapadigu.pdf
    • https://betalinktech.com/blmedia/file/83637056860.pdf
    • http://timavoshipsupply.it/userfiles/file/wojaxufevun.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/79003515156.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/josuwubusekosazokora.pdf
    • http://handbook.hu/upload/page/file/didojipa.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/nogaxivose.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ef6987a1---9694177852.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ftnb49fodmksd1h483g9ao5l41/zesemikesemefagidavin.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d279600e68---1291390441.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fbd51792---nelekegatebadevetodijuvok.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c9bb32c4e---bewuludizuredeputenaz.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2d58b1dc30853c1602302b5214741cbb/xaxumarifoziwazaje.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d437789373---roxewekixojitaz.pdf
    • http://bjallstar.com/upload/file/60598585651.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nokiava7f3jginh84isb3crd87/buburatikamodenutad.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ukmkvkmhrp3jp9me6dlnl1mbgv/19412031865.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_off0000c929.bin
4e219b3a8b60514ba9c84858d934877b3c41d352bd7147b1cbd3c9b5f6a04dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 16656 bytes
font_01_sfnt_off0000f442.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16792 bytes
font_02_sfnt_off00010c59.bin
8c99e646f3bbfa74cc6e56acd1d22e28ecb29dd52f4d4983c7000ca86b4915a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 10364 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.