Malicious PDF — malware analysis report

Static analysis result for SHA-256 befa9b18a42de6e4…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 21:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b77690a2386300b32a8321b6870ddcf SHA-1: 73256c15742434f13b8a2c6ef1d1ad02060a2b17 SHA-256: befa9b18a42de6e4da7999d2ec09381c5146aa2644ee358ce456d0cea2ecd1fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae43df2ca---84675292371.pdf In PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/jerejuvis.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/34266488777.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/67523320185.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8adc5a7ea---94506330331.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4c374c77---xovif.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607345ed684aa---43253687435.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/fewafe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d17fd000f---77296919126.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/i7d1l11qcog9libli6egj81lud/29715874416.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/57849993702.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xatigikudemixe.pdfIn PDF document text
    • https://banghenails.com/upload/file/nuxakulalonijilunimedivot.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/nusiv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5175687288.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6281fb75e7---5080090821.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7890e4b74b256318a5c84408d6662ddb/54346828097.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zamowilizuvepe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v943bj22lit43bs7np83firu03/78591605607.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/1993849777.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/30bfcbb81ac83db088044c188926e80d/zuwazejonuwemefur.pdfIn PDF document text
    • http://vo23.ru/upload/file/keduvofelabesarekis.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6242e060cf7e9d7d4301183ffebd19ef/gijejeligibuvun.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/nugedisepixif.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ecdd94420095acfc777c44b024487142/43880159758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=elevated+lactic+acidPDF 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_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 17208 bytes
SHA-256: 501e2991cb5e495bae5564fed582432db4581a5873537c97d85bc2d8257bcf27
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 9920 bytes
SHA-256: 0aaf8b7cf12e402b17a6ed7fe6ab72d16606a390b0ce50cc7916a9ffd638f3c4