Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd53c2aede5e43bf…

MALICIOUS

PDF

74.3 KB Created: 2021-06-24 13:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fd4b9da732dddfd49a27a4ffb58e0409 SHA-1: bf893ae4a4adcf3a3f3ef97c25fdc331af8a48c5 SHA-256: cd53c2aede5e43bf7083be710360fa885a1b01532a51d5ac0f65ea406ac54a3f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a lure for multi-factor authentication or one-time code harvesting, consistent with credential phishing. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the ultimate destination or to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mqjntredab8ht78tkbhkbgtvth/kufuvuturuxavedufegi.pdf In PDF document text
    • http://italianopizzeria-pg.com/uploads/files/zopumefujosasex.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/41520051150.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/luwuvagimavomozezaf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012a44548a---paxusifo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3jr7rdp32t4isenk11ofpind76/detikafenotiwutat.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160987ed319bff---xamotafenomuwepuziwa.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/59009404264.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae18d243e9---94139582380.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/32ktn3m3i6ks09sl0qe1bpc3i7/dugajotibutademi.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/bowunapel.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d1fa1c7a---dopewigixonebupebiv.pdfIn PDF document text
    • https://aneri12.eu/res/file/gokinodarego.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/feb9b439c17a4ea97855cc6ef53bad71/weregepibebuvijawejewuf.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/49390200371.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608855fe1dc52---selawubizinosunowim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+fill+in+pdf+on+ipadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 4484 bytes
SHA-256: ed1d822cdc80dde0db1e43e4c811c755faf93e151babf7c406c32d118a7e027e
font_01_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 11020 bytes
SHA-256: 4a13fe1ecff0f35fb6d461e1dddaa710eab995e8db48e50f387cb8279bd3c9c5
font_02_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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