Malicious PDF — malware analysis report

Static analysis result for SHA-256 e773927d432bd6ef…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 06:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d568731a85031cf9a06d47b0dd2406b SHA-1: a33b45faa90906ad1b0554dfa4296473e78acc0b SHA-256: e773927d432bd6ef5f38152ee020f27430f3c5d31c66cd1bc3d655efd236452b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file containing JavaScript actions and embedded URLs, flagged by heuristics as a link farm and potentially malicious by ML classifiers and ClamAV. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious sites such as 'http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0b10dae6b---vabusanawekapotimamexe.pdf' or 'http://www.tiande-global.com/ckfinder/userfiles/files/76099772869.pdf' for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.tiande-global.com/ckfinder/userfiles/files/76099772869.pdf In PDF document text
    • http://coffee33.ru/archive/file/18358518974.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/pagejeribetivakak.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/40473196158.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/92790841565.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pomegevulikowivokajojugum.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/mozokeju.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sefavifapifitajiwozax.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/dawujajoruvevukak.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16116399633135---bododugedelaludevoje.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vidime.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/gefugavaxegude.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160927ce5dc235---nupopubinasone.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///60070337324.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/34d4fd0cafb3b41afcf76b447f617d14/69892596001.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/rumifeje.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sunekemurixawezekazululu.pdfIn PDF document text
    • http://agrion.org/upload/fichier/121977721.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0b10dae6b---vabusanawekapotimamexe.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/pesalok.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210717_043741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+pdf+file+in+wordPDF 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_off0000becc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16904 bytes
SHA-256: 7517a8da1cfcd1d715dce8146d3ba63cb674e025ee47a729c3a09b480ec6fd47
font_02_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 10808 bytes
SHA-256: 73bf33499e8b205e1226022bd91b190f9dc8a37ae374bf5dea687bebb7ca1c23

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