Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcdf8406e69cf6f…

MALICIOUS

PDF

86.4 KB Created: 2021-07-27 09:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 336b992d05a00178231f2136e87221b1 SHA-1: b5ea6ae4cfbb35934d70928eb25632431107621b SHA-256: bbcdf8406e69cf6fd146e427bcea8dac2329aa0c706bbee2f0ee3d3eeb1dae7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://moscowfashion.net/content/xuploadimages/file/mexufixakopu.pdf In PDF document text
    • http://cortabellanews.com/userimages/lererarivesiworumapaxileb.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/pisegomuva.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/id0ro15407d31oggbkj5eu1qr2/97884794756.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/mavakutivag.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/pofosizufafegogapubanob.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71a42e686---5314421787.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/jepekum.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b774445d1e6---zonifepixowonuvaloju.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/80997644847.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/isuf1vo422lfta9uug1fgdco9m/83519998171.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c42faa2cd41d42753e16706b1cff1a2f/93836634859.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8538ad0cfe---jevoripakup.pdfIn PDF document text
    • http://stattus.com/assets/file/jeditud.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a7d5e8728562a19a4b41db06a042d22/vipirasizadilumuzem.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/95249321581.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a05ad3b36---10167148976.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/telenotilokikokulisuv.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5999a777---xewejas.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/62099581607.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072822e45421---kololunesimiro.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace88e8998---falivap.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/79315178607.pdfIn PDF document text
    • https://melz-feu.ru/upload/novonilikajenomedezowada.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zikimefezenekafurivik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=why+is+my+xfinity+internet+box+blinking+bluePDF 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://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_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16960 bytes
SHA-256: eabc11bd5afcbbf8120a6802f083c2e80d22e97dc38cbfc333881ab3323764de
font_01_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 11040 bytes
SHA-256: 6a2f4a3011fadd85a6e9d900bac1d848b76788dfe7e04ec0818f431b2a2822fd