Malicious PDF — malware analysis report

Static analysis result for SHA-256 4272bfb8997f99eb…

MALICIOUS

PDF

40.1 KB Created: 2021-07-15 21:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63052b4075754f2f17dc4a77ae02c11d SHA-1: b100a039abb3f1d74ad42c4e37e76fad1a966c51 SHA-256: 4272bfb8997f99ebc817dda6176e5c2b66a5a5259c272eb677f90932bc6abf98
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image designed to obscure a clickable link, directing users to a potentially malicious PDF hosted on algorithmically generated or compromised domains. The document's structure and numerous links to external sites suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9455

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b983b4f1e---zinekuwoduwafodig.pdf In PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210707195559.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c803c0cce5---99881070912.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fuzolisamatikano.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mowutedikejijavuw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa83d0b846---56612939087.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32f91772b---wajukoxokiso.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/85157319250.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b800b483---jegogitozadujume.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bk1aa06k3jn6ahjndrbkhon182/rupuvekisifix.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/rufibuvixi.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/2061174507.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/nibegojawunubafur.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072964f38dc3---zoxadazadi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/onoopq2bkl0bboja3gvmd23kuq/5309858398.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210705_465202D3415FFB4A.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/27278205716.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/metinoxafisadebu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160794bb2d8342---72700447104.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/daxobafeka.pdfIn PDF document text
    • https://www.ppmcarIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+am+five+letter+word+riddlePDF link annotation

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