Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffa3d3bf0c96063…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 23:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 187e07f16330de6fd26674c11b25f17c SHA-1: 1c1dfbd651b908841d19e8f05e4c541879bc8f5e SHA-256: 0ffa3d3bf0c960631193d2705bc34b14df1e4f59a530eb7465e0b5621e5eb081
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm to lure users to potentially malicious content. The presence of external URI and link farm heuristics further supports this attack pattern.

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://pistant.ru/uplcv?utm_term=italian+words+beginning+with+a PDF link annotation
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26b943e9---42707417426.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4800eab5---sidozobapexegoxeka.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/79383512860.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/wajasurixakuromitamovo.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908175215_675142359.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/pawixabiz.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/kumilugedowofivu.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/59707139426.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/vejotudadutukonawoxaxo.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/68731002612.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/46832253639.pdfIn PDF document text
    • http://effekt-film.de/files/file/13461364710.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/48281880325.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/80307663132.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dad403c2---dovazugizaj.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163111638485649329110.pdfIn PDF document text
    • http://rnralpha.cz/res/file/nevomujulitu.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/wetakuxalik.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/88418254460.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/859661325ac0f08d77c2b5743e8df6f2/kelapujobe.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/dumuzemenurine.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2936a78a---joxuruw.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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 19576 bytes
SHA-256: 8e7e610f154615aa59aed5a3a4aba58a0dc8154095237de66928c1af0ed42e1b
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 10704 bytes
SHA-256: f752f88dfd18232ba25f317c6fcd561780626f600070081e6d80949aaae45c3b