Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7fed00abad1406…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 05:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3202d31998cf1fbd159133a167a2efb5 SHA-1: d33d2ca1544c63d1b44ac04a6afce38a8d043a04 SHA-256: de7fed00abad1406193d861713a88a5399488b9287585245493398f460184e36
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, with several hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://zbigniewrodak.pl/galeria/file/gopivugevemikera.pdf In PDF document text
    • http://offerparts.com/upload/files/80303729098.pdfIn PDF document text
    • https://aaaxxion.info/images/file/79864150466.pdfIn PDF document text
    • https://novsport.com/content/File/jorevudofel.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/35326681802.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/01a88f29acb8227e74c1d2ec95bf5900/89258521816.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/52780736870.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lavuduzurekas.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/11786901749.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4adb72df93c50892ba0e88605e77c4d9/nipidazozaxa.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/53834290536.pdfIn PDF document text
    • http://consade.com/userfiles/file/35447016851.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/20014179996.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/62712724359.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/larivajewosibovatutopi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152052e9fb5b---53433429466.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/53657657462.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/dovifetunup.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/sedizi.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/dulijadodisigowogevos.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdfIn PDF document text
    • http://mlead.net/images/e/file/98974157354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=arcade+games+for+android+offlinePDF 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_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 10704 bytes
SHA-256: 2fc7ef337d2461de27981398936aa6ed864ad9cacf35f7120099c02956191dd5
font_02_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 17056 bytes
SHA-256: 04543eb86a1b6fa742243cf89f4c4a1d2030df308c249b4bcaaf52066813e7ce