Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f8624d56019f7a…

MALICIOUS

PDF

75.8 KB Created: 2021-06-09 22:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 31a2a7e211c31964d13245fceb345d24 SHA-1: d7f987a7ad9e0e41ff0d4d4310dd71a699e41533 SHA-256: 64f8624d56019f7a5f6746f7fc5237a2708fab8f5805ac3cb850bc7d43dddb1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://infrive.ru/uplcv?utm_term=the+difference+between+can+and+could PDF link annotation
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fb2fdbc5784edee64d8bd54faa7d9223/woluzubedineku.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/68420445067.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tulavokubetogukaduxir.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wizilugekumo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//nasefaxax.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/51324511109.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0047b7136ba3f972fb7bd7fb367d7f20/wiwalewodejukuj.pdfIn PDF document text
    • http://falerisztika.hu/tmp/46489741416.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/lebewamopukidi.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/bomufedotuxo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6087a76c78c206cc88cc7b61161a7f93/puvama.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6542d55e6257f144af8bfc68473ada1a/norejiwotewuminosezu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b599b345---96371998593.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c096c190998---nekubugiveli.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a21f4c8721c---56430841146.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/52333120082.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/lv7mekqm93m867imm3kvsscg7d/lasuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 5112 bytes
SHA-256: 8a16de297f6bdd2b5323c0ca8a3ed1bf25e3a9fdc3f5a29d13c7bcdb799eab2a
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 10948 bytes
SHA-256: 5e70bca75f5e9d1b1dc0118b4883c2b7a314affe4d8eb6f970fee710d6a9a75f