Malicious PDF — malware analysis report

Static analysis result for SHA-256 781f6607ccfbf3fa…

MALICIOUS

PDF

73.2 KB Created: 2021-06-22 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e21cb4cf3b854a02c3e0c882690a3942 SHA-1: 00ad4d6179e867b2c815af8538d22439fabcefde SHA-256: 781f6607ccfbf3facc1fc8dd4294524212745a7b2fcb415640d655087899a935
176 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, indicating it likely serves as a phishing or malware distribution vector. The document contains numerous links to compromised websites, many of which host further PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of PRC/3D content is unusual for a typical document and may be used to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9647

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c466d996546---56734235888.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab978319a7---82621953377.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6d9dc879b76a2492f823600dceb64061/2462380127.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/17759629299.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9fb1000c393b4ced46b40c484b99c036/18337683787.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/93327995148.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/rutebad.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kiwonu.pdfIn PDF document text
    • http://centronegozi.com/public/12891908152.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/op6v6fh33rivph1gafk9bqvc40/gudaluvuwumuwapajiwitotus.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085339bef782---45627916028.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ceade99b5b8de8665a4ed8bb8793c4bd/mazajovupisuxadon.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8m4te0cn5262t0ii2g4rb0erun/nuniforipidopi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd614f836---66153102230.pdfIn PDF document text
    • http://wami.cc/data/files/3798846860.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb1dca41c---93892399109.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/882d32878506da7da4035f2497983d08/nobedexenekasun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=galaxy+2+44+user+manualPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 5252 bytes
SHA-256: 7057d89fde04c16b12808e8a272d65bb88725f7e1e75cdfe94028c3e8cb34707
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11120 bytes
SHA-256: 104fc2398f65e1229a0db085434c7245915d99bbb3264481001240b4702965e7

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