Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b75a9f3e90b8c39…

MALICIOUS

PDF

95.8 KB Created: 2021-07-02 15:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0793b53fa771d5bdf05c1a3382b9e9b4 SHA-1: d4b09832270cd35fd4865721ff1212b9462396ee SHA-256: 8b75a9f3e90b8c392562ee66ff3c59f88ac141d6176be15681f58c4ebc91f061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious content, likely exploiting a vulnerability or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a413d6fb3---sawux.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8875b99eae46231dd75d98ef36574ece/5918838490.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160989e376f627---83051727470.pdfIn PDF document text
    • http://apsons.eu/files/file/mevagolurosajefisod.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160daac481ed45---92830353160.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a7b00025---11433127972.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf1a0eb2---40099438549.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hrkpg3ajoip1ple2k3ffjqmu0b/suturipunaruwaravidozudu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/sbqqjb6hpl3bpqghllp3knk32h/38812573317.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f8aab96a---96189932167.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4a66f5168ee5f7184970ce90592edf22/wajowepizoma.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bbefa06aa---44174476874.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/tusawutijosijonexusokodaw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f75f8d37c---filonex.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/buzud.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/pinaporagufovabu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b12913a3961e91458dc84b617aeb40a5/74913793676.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/bogapi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbceda239db---17595515426.pdfIn PDF document text
    • http://debden.org/userfiles/file/59121173856.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/vuwadikigabipuzu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a4293bc9---81407538153.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/lonipafiwumije.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/68130931822.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/81262007475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=from+dictatorship+to+democracy+pdfPDF 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_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 17792 bytes
SHA-256: ab4a3a25cae47431a21e7f068c796a2546d4304186f61ec597a50fc0b9242036
font_02_sfnt_off00015892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15892 10824 bytes
SHA-256: 5e3b2a22c23cea73649c9abcba7dc4fe16d0fe0725f58b22c4e0ac784aa8c1f0