Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52ef317f40ea26d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 11:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e91148ea57c56d8512e336dabb80f2c4 SHA-1: e85dca066713539c01fb8aabc84f3e15eeeb9202 SHA-256: c52ef317f40ea26d172ab8caadf44e3f23d8e83196caeab61bddd6182eb89ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=game+on+ppsspp PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326b6817081---46074155253.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/43620385815.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/92295332568.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xujumanabazakarudamewuj.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/manajojokoxarataza.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/mukugididovetokozoku.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ce9cb68cd5bc36510bbd592ffdbbdea1/1482612172.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/9536500117.pdfIn PDF document text
    • http://360global.ca/userfiles/file/9516462098.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10cf5b33b---16084665305.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/11602238645.pdfIn PDF document text
    • http://4bx.pl/public/file/gukefuvilalapuwuwunizon.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/82882256843.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/goxazebilejimuwe.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jabebadusuretudijinotovi.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/85712928103.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/97359517576.pdfIn PDF document text
    • http://profstil.az/userfiles/file/16452980307.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/44058488480.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/85480283595.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/66776313572.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/ruxomopi.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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 17784 bytes
SHA-256: 033c19bd9f0c70aa6ac2ee17801fa4612f05fde6278487bcfdcd5ad87bd7f6e4
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 10116 bytes
SHA-256: 99704003ee47b7110fbc2475642c8c60bd9c6358c949f736ec86ea8dbd890d09