Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04e729f83b5a9b4…

MALICIOUS

PDF

101.0 KB Created: 2021-08-11 05:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a0f27f1b0989f8515433ecf06d132c8 SHA-1: a6578d899191e31b13dae7685b61e7ee9b1f69be SHA-256: b04e729f83b5a9b4aca353db6200d69af01559c3587c9631d0d9d0e3f0a893b2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to external sites, some hosted on compromised WordPress uploads, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document likely uses a fake invoice or payment pretext to trick users into clicking the embedded links, which is a common tactic for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=how+to+write+mail+for+payment+confirmation PDF link annotation
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/54088435392.pdfIn PDF document text
    • https://yorapp.it/file/kisibemox.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40f912361---boradolak.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c061cb296---32917970204.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/89647972887.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/20523861999.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/35737582931.pdfIn PDF document text
    • http://orem.mn/uploads/files/51301750472.pdfIn PDF document text
    • http://emeat.ru/var/files/gimesozopedubekigun.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/7202969178.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a71b0704---bavimexugulupebiwumomiwe.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0jhlql3om6ta9urqfk1db0upeq/jukixivonudizujobefafoke.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a4efd0b---finameluzapudufiwilenegop.pdfIn PDF document text
    • http://www.bash.cl/media/file/81212773682.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8f9c0bb98ee04a35195301a1000d76e3/844902069.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/kemevediwabuwana.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/volasitizivanazirezad.pdfIn PDF document text
    • https://koratspring.com/upload/file/muzijeg.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3c3f0bb053f7a7346dff75c7a905bd6f/19826472156.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a5eefd6ca7dc9ee62a55048856a04734/rarir.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c05b1261---semulepu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045780cbeb1---78294536536.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4a717215---63290362580.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/16609532524a36698d1da1033ae04c00/65806711244.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff86f0e71---82671389322.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qs07nbmqjagnn51l9rm70kk453/72277770042.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 17828 bytes
SHA-256: 6fbcff79b2d2173e6c4d23da5ecb9e229cd35f1ffbe4e60efc7efb4b9626fa73
font_01_sfnt_off00015389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA0 10664 bytes
SHA-256: 2fd930dc2e1e29d01ec144da971f5e5e214654a64151ba6fbe2b55dfcce4fc58

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