Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a857707eaceded2…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 05:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c122477532f433c8f12725d6972285e3 SHA-1: aec08e883e54af52dbc21cd250a2024b59ecceda SHA-256: 3a857707eaceded26cf7c33a24b092d5bd00bed9701113fedd11619b26b6cd99
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86d504eda---rajapefomavisigozeko.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/180b5b2435854e2d13f1934a0ae96b15/46880808084.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/209afe4a685b95ea90e5bbdba9abbd5f/wonope.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/piu8al7ksgup7o41730lgp7o82/42382080998.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608533207809f---99884131371.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23380016e2---81730194012.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9a5b07fe8a5d665dea84304570b9e81f/pijumi.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/cr4ei9v8jn9vo1piaivocbjs3p/jodanudutijesa.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14375af807---59673787521.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f0bc7539---86612378538.pdf
    • http://gdbchurch.com/clients/43262/File/lepozumisaparifuwokeja.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b8fb5a23---saluwikifagiviragodixiv.pdf
    • https://clove7.com/userfiles/file/3023933528.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4cf46be4---63234160283.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070311f06e0a---bunir.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a82c502f0---17272234186.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/82335e643b5ff25d5d6a526e43a93e39/sidutipekaxes.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/16524005419.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/05737eeed02b4df6d50f767dcc93b076/kivomukodiratufumif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=informed+consent+waiver+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f9.bin
8b9f2f18e1aa892c3b300118222b24fbc6ecc44719e5f0f161ca32245e362b43
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 10988 bytes
font_01_sfnt_off0000fd86.bin
5784b9f87541d5d0c15260d4b1b850a5c6ca050764759e9754776fcc6ebc61e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 16860 bytes
font_02_sfnt_off00012928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 16792 bytes