Malicious PDF — malware analysis report

Static analysis result for SHA-256 285edf9a7593dab4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 21:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14b23e594b28284392768762b3cb06c3 SHA-1: e93beb9a9245b1c3173ec2f12572586be3243c90 SHA-256: 285edf9a7593dab457cdb0ae8651946f369886b4b4e6db65efdeb3b75bae7077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm to lure victims to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://catamma.ru/uplcv?utm_term=physical+therapy+books+pdf+download PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd4e980f5---sexizunet.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/remufiwikide.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/52186008167.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/tobotogomasikomi.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/kurisujizobabim.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2e76aafeffc3c5d889f01ed46c440b07/95233654388.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceda1bfc3c---28522530461.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b43fca6ea7e---gevuputeduvope.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/fukakafaxibusibedopazera.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/tawavuzikunupozedepimebot.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/gafoxexowaniguzape.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/768omtsr19fjtfrl3ahvm0hdsg/68465613459.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0531973932bdc0e9ca0bd6655f8f0531/beruda.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/8179187265.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d57c482b---31002416915.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010c53554cb---ruponibujaxewo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///netoxopapibujifomulokadad.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/60074499522.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/15776639619.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120cb0d96cbb---soragadipafoxag.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/40077677221.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 11148 bytes
SHA-256: 53bb1bf9deca7c5f6e5c5e86614eeb28f3b78d2f69c92a1d1a6b6eeb6370812e
font_01_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 17320 bytes
SHA-256: ffea26a61733e0509e201310d2acd7b379190241cc099725cd215b74a0049235

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