Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbfc9bdf6c70463…

MALICIOUS

PDF

84.5 KB Created: 2021-07-14 03:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 829512f263a8314277ae1e4a45587219 SHA-1: 750663f613f44da8bfae3248cb64ab42f813d65d SHA-256: 0fbfc9bdf6c7046369dc8b0119ca8730351843971ea4573e4dd7cdf37f72edeb
196 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. The presence of PDF heuristics related to link farms and compromised CMS uploads, along with the 'SE_PASSWORD_ARCHIVE_LURE' firing, suggests the document is designed to trick users into downloading a password-protected file. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=how+to+export+spreadsheet+to+pdf PDF link annotation
    • http://aeronautike.com/userfiles/file/wanunedilijofolesat.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/tinipejutewikosipifam.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/zoledumoxumud.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e86a1e214df---47350808901.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a988df8b13b---95154574824.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/80092777187.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dd79ebad56f---zatapaje.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd5eba814---73265856167.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fuvisoweja.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81426243094.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/gopaxezexerutofivi.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/72429121735.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/k8hp44hl9uh44q03tn4ivteak2/16861027753.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3uict7v9kof7df976h30pqic67/lasurabasodirinitokexox.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/74511444980.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608961c675d0e---92072132500.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68d5e2b4e---reboponidukonadugiku.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/70082458503.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/49857541486.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/eb54b981e4b4f521693583287c84429b/keronawanosakon.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/kunugor.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/bezotukadosa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8cdf7db669f32a207e88de186ef9457c/vivuxedizorozigol.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/xomajexi.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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16700 bytes
SHA-256: abe7299ff67872d76f744dc67f3d40644d67c9ded74b5a8a23c53d19152aac1a
font_01_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 10532 bytes
SHA-256: be7adb6250df82f8edd01d49570575f3832fc31977e6eb3edb3359906aa3f103

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