Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29dbe6e9a2bffae…

MALICIOUS

PDF

82.6 KB Created: 2021-10-14 09:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9dcff3abba9be6e160512250840c1aa9 SHA-1: 3b8532d0811ec585a1db48d69f9784cc622829c4 SHA-256: d29dbe6e9a2bffae51a05fb7941fa4175444bb3add972078d7746bd74351059a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to external PDFs hosted on various domains, suggesting it functions as a link farm or a lure to download further malicious content. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick the user into performing an action, likely related to payment or a fake invoice.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/95883983881.pdf In PDF document text
    • http://softtox.pl/new/userfiles/file/31629912444.pdfIn PDF document text
    • http://tzsunup.com/upload/toxedapezasajujonojobejom.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/nubipojax.pdfIn PDF document text
    • http://fygl.net/uploads/file/030544172385.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/jowapokuwujarox.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/71050071920.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sexabipof.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/98461800823.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/85876209508.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/figuveju.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/7639429640.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/78868186788.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/kimepugamobugid.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/51754eef7dd86eb030d5ee9ae0258c68/kamofogoworepetu.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/608692612.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mudaduwufeguguvi.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/xojupilatavifewoxifapik.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/60940085591.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/ranotun.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ddbcf56a4bc749bb15a069b530baab5d/13603217462.pdfIn PDF document text
    • http://bankerz.in/qpic/files/kelavufebopemedevaxazajat.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/46004774709.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132af38a189e---47638478774.pdfIn PDF document text
    • https://sapporopools.com/contents/files/gedogove.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=that+is+grossPDF link annotation
    • 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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 10068 bytes
SHA-256: 52374fff14a27056f41a77a21fba1ac6b2c8a7a7526515bc210ed50cae29efdf
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 18092 bytes
SHA-256: e6e918c8f17f23f1445fc7b68d1474bc4a23c67c65c44f16bfcfa145670de18c

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