Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fc2af28055e815…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 06:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7b20f17e731cac9cc04a9132fd71e42 SHA-1: f1164224eba7debf5ed9f3588daf7a896805c844 SHA-256: 42fc2af28055e815227d82b2af4d51ee0ff83fdd1f3740994df6596b3ba7c61a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an effort to obscure the true destination. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6uu1m0k7mrmk9mn62fjaajlqdn/49584011936.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/64426780308.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/42481713622.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e24aa08a---jofozolomipakusenufani.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/rifeseduw.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2056eai1jj07tn72u8rfuaea2h/4405182173.pdfIn PDF document text
    • http://melabo.com/upload/files/jilowagikotuzakuxo.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/30010112910.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gisodopugunegawire.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf241432cf3---68083659295.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/35070318946.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/21478b0132fb4047ffc6330ef1a7d3ff/jijutaxetewosozevanoko.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/62407348734.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/93108875282.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/64811510861.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ub15sbsakcbhu664n8mr4t8f3k/49232777040.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/xejajulajawetanorotopiwom.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16104820e0b25a---rafadodivomivitobatafokim.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/94784639794.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/puwipotesu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/gimej.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/sinejedebopotim.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/28656296159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=communication+in+marriage+bible+study+pdfPDF 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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 11348 bytes
SHA-256: 0cb48d14e2d600ca3240f2b1769e6a8c7854d599ea990be39e95d03c8c44e9d4
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 15668 bytes
SHA-256: e82d3ef7720ee81243a149147b65886594cdc0200b30c8ff3b4cd53938dd2ad5

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