Malicious PDF — malware analysis report

Static analysis result for SHA-256 1104c886b863d2a7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 07:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 027d7d54ff179402de708fea2ec9dde1 SHA-1: 2ad9d8a96aa9cc157dc74991003922dfee8c726f SHA-256: 1104c886b863d2a7798eb6b10208a0bdecf631a718df0741e0bded4fda016575
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories or disposable hosting, indicating a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imhome-listings.com/userfiles/files/sajenalasesazis.pdf In PDF document text
    • https://nstyapi.com/resimler/files/35008775576.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/tokin.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/bawopexesixenibiv.pdfIn PDF document text
    • https://blokhol.com/upload/files/97890427795.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f68338c6---62407758559.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/mevavixeviwekuzetuvip.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/73874272168.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/96190169020.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rawaxejowezinagemorowi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/85e417accdc1f2c7e0f9d0db5659008c/nodusef.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/70074484218.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/69333424146.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/fuzekasatojopod.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e7a84213---68259141254.pdfIn PDF document text
    • http://home-plast.ru/foto/files/88259286235.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/tajumodenalinokekot.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/91116340345.pdfIn PDF document text
    • http://asid.rw/userfiles/file/46174192616.pdfIn PDF document text
    • https://finliz.lt/i/File/wosipoxusini.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/98074879213.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/79310721628.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jexesezumasozajux.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/67421420923.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/rijezirasutisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aplikasi+stop+motion+android+terbaikPDF 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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 16428 bytes
SHA-256: 9f5d33c6a7a2a8f0236290b6a98290b9e31126953a36766d9972c4cc660f8fa3
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10764 bytes
SHA-256: 94c418f091f643913adea9e17e43fd85d4c070c64c10993a8c975f0bb27d495c