Malicious PDF — malware analysis report

Static analysis result for SHA-256 43176f6842ee0228…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 17:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 444390f5f1ca6abd23c852da176d7889 SHA-1: 2f4472fbf2f15a8849910248592ba9a69c469d3f SHA-256: 43176f6842ee0228cc9b27e6cd6238e649368643afddfee6d76a753374423bd9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=pure+talksport+dab+radio+manual PDF link annotation
    • https://samavetpharm.com/userfiles/files/raxivesujovi.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/pebajanapabesiwe.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/94722272672.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/67101773103.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/90127899397.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/dopovimoju.pdfIn PDF document text
    • http://ahchala.com/img/file/17015348068.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/pukubekonoj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c541298acc3---20731498644.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/d99fd50e40f38c21e9d99b858e5c2adf/vujifunanajarejoguxij.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/dusesekoxorifapewimataz.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce898bf87---zirun.pdfIn PDF document text
    • https://cncunse.com/d/files/7847042115.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/18976611389.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/ganurukesuvuli.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/5885924519.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098337aa7264---nusubomuwixemem.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05be8ef1d---87657006477.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/1627927661.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/48753934854.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612775101bbed---39809445171.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8a354689d00abf32576f4d479c141543/dosudekumowuvezurunofok.pdfIn 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://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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10888 bytes
SHA-256: aa6df68d9d5ddfd2ef12730f1be0aa19dda752e3ae507c8980ce8fcf72751425
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 18900 bytes
SHA-256: 0ef850770e91efdf9277fd7f06e166bd1d33fbe9435021f1377f6fcdb5d8f7fd
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1