Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bc17d3b4e49fdd…

MALICIOUS

PDF

94.1 KB Created: 2021-07-04 21:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8d3be73a02ac838b673b1ac3e62e343 SHA-1: 3559cda38c80ec64960754b4873b6850e718e369 SHA-256: 91bc17d3b4e49fddaf77e5c643ca108afd3c4b65da73e2172b52634db21ecd14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic point towards the document's primary function being to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://castilloexterior.net/ckfinder/userfiles/files/bufepudowalikimamevuvod.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4cf9a00e8---kekuredimuzi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/un1amos93dg3hmm8vqj3op092bjndr8c/2303854682.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/46516238441.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/t39hmhdb579u0ettcpadertina/jegedevagimukizuwis.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jalowi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160df28ba4d3eb---zuwibujej.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2ugsnc855rp8dj18oktgmvph55/54291915818.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac18455dbf---52024350369.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/jumoputopotaperazituno.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/fubowiwilomemat.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/kasug6g80qb3k5jmgo6as5n2n1/33064643694.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/naporavaze.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71411003ef---31049294142.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593cbe294a---17163411301.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/loxetuwobusipepivu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8e692d129e4484c3ff93fa29f2a5ec33/35785400124.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/177f117282da5c3c2494032d2143b752/90240818383.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc88469331f---wezamewubipekuzofubeledat.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb3748cd7---86953822666.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/weget.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/84072015880.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9eejdvpuevlg870k630ndon10l/79543383368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lil+tjay+i+need+you+by+my+sidePDF 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_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 20240 bytes
SHA-256: c8d731a119e603e8ec7b2b2ae2c73e76a170552659557bf86b95eeea5ec32f36
font_01_sfnt_off00013a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A71 10748 bytes
SHA-256: 8efe9b81e1590204c0b350f25621641d39c4c7b6e19ca72920df43f969f23754
font_02_sfnt_off00015314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.