Malicious PDF — malware analysis report

Static analysis result for SHA-256 2174dbb4f9096235…

MALICIOUS

PDF

88.5 KB Created: 2021-07-31 06:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d1ba0b920b06811ea8cd0d76cd5803 SHA-1: 2c4fc4600fea30874fd64ea9233f3b5a660643fb SHA-256: 2174dbb4f9096235d124917ae87581ee7ec6c1996fc9e561dd818e60cc17bf09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d886626eb5bad731aebe4427d5350cda/kubagemozo.pdf
    • http://cwesp.biz/upload/file/womina.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ogluu9lhsknlclj3ci34sghbp2/84011713143.pdf
    • http://apvn.info/userfiles/file/kosapepinonutobaxesefuxe.pdf
    • http://msamerica.net/clients/873634/File/53157839107.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/q983lff4chfvpg2ta6b8hgg58i/wikoke.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ctlcftk7nrrlngccsgplkn7h0f/16373972036.pdf
    • http://starke.ca/clients/84205/File/5996489772.pdf
    • http://activesolutionelectric.com/images/file/76555552587.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/ditapagesifanemizo.pdf
    • http://cheers-gifts.com/userfiles/balusexav.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/69362307010.pdf
    • http://gyogytornasziget.hu/uploads/files/20987028727.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d079d83f28b---4614232060.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4950caba83---zekulasobewazi.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/toxejezire.pdf
    • https://yar-net.ru/userfiles/file/64555805983.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/db530de72b6e3b659c819f974be1c904/92268606512.pdf
    • https://plasy.com/uploads/file/kudizajotesuxaron.pdf
    • https://hansenlight.com/UploadFile/files/99524183329.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/77322684640.pdf
    • https://renault-service.com/userfiles/34880721881.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k73qdghdv5o8mbb8ntj1si5o15/wikuxodalugabewewulovowex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+considered+bulk+mail+usps
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dcd3f2f7dcefd31566fc2c7fe33779dd/89495142887.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_off0000f5ca.bin
5766f87a89f3fdc3a67739f98a783bb8b1e827424db3439a52bc149fcb2b9b71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 11104 bytes
font_01_sfnt_off00010f46.bin
f9923559ed18686efa7dcf6f1a1cc8eb99a4d786589b7b7e7515c065a8b7020f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 16852 bytes
font_02_sfnt_off00013b6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 16792 bytes