Malicious PDF — malware analysis report

Static analysis result for SHA-256 896d292c8545fa41…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 18:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e0bb7ee2cebad812d9e5edff7cd9162 SHA-1: ae7c1afc7f8db62118d1cbdb30a35bdf69b00e7e SHA-256: 896d292c8545fa41189f7e002284cab9750fa2b4ee2d1749ba39ee996b7836b6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. Heuristics indicate these links are used for SEO manipulation and potentially lead to phishing or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

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 https://medvor.ru/uplcv?utm_term=best+file+manager+android+no+ads PDF link annotation
    • https://elsadaulte.com/ckfinder/userfiles/files/30388606654.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/lobaxeb.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516370bb---totafes.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/biragojasika.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/biwaxawemijemugitanosuva.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/sovip.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/wikalodojuloniraw.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tubevefasidoriwixezivo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd083d0917---bosiguzipujelobapaxebida.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/fileralomisemotumi.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/77819923099.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/28721278590.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/10610540734.pdfIn PDF document text
    • https://botroul.be/uploads/29113818129.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/395929e621193bcdc0df23c3cc518db1/60913597740.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/48426823669.pdfIn PDF document text
    • https://susta.vn/userfiles/file/82170282367.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/5050584016.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/44908778138.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-5/20210905203131709253.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mp1k5n0dhveovp96q1d8beq06g/91652884886.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/52814789158.pdfIn PDF document text
    • http://chpcentre.com/files/file/galedemupuvipixivirujagad.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/zejawinoretatapedo.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/91772288378.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_off0000b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E3 10752 bytes
SHA-256: 7ec46184d2decccb121a045f4f2299a991271b28a3fe4ae720bb33c987159f92
font_01_sfnt_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16212 bytes
SHA-256: 1aa82db73cb2aa1d368c4adfe696471308bb298cb9395f5ba779fb1576c40de8
font_02_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1