Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e81b723fd8f2ffc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 11:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e3ebaa5ae275f4ef4cbce646106fd583 SHA-1: 9a7da75aede4d3c3a531fff710415cd86dcf59dc SHA-256: 1e81b723fd8f2ffc45e01d1ce1cb72981e0af09bf6e880df384c8620b4940756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=mishto+camping+fridge+manual PDF link annotation
    • https://egyptsuntours.com/userfiles/files/bujodixigumuralowe.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/punularasatamokazela.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/10096836165.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/xipiropusidodeko.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/fajofoxagivebedivasesenug.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/9041118774.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d663467e---bulag.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/nunipikegalokudi.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/88746118097.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cb7905672---tepit.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f585cd0be0fe93fda152e2bf776db59c/9847267796.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/bedefukepekiteboxisir.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/13080982624.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/66172594570.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/14441974655.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/senegopogemuwixake.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/fecaa3ef19290d55d2eeaa3105f63c17/69202460134.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/98124755967.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/87255115326.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2d53cb3fcdb09ec9a245caa175570a05/rodatol.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7341664163---bipexogegamonoka.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/wofuterisonipibibaja.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/dokefowagor.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rtsda6dlbnhpsc9f85n0d90von/49531341914.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/53147673330.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9k5i9pep1ka7v4ca2c81e4jg6/85385754131.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 11160 bytes
SHA-256: 8519ab55eba707ca5e1d8c2db630bcc3c5cd0bb7c23b78cbaf76ef9091579f0d
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 17968 bytes
SHA-256: be67d0730028de8a0a8d27b79a7be985ed2469ec4bf6f093ada38e738ce8b6b8
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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