Malicious PDF — malware analysis report

Static analysis result for SHA-256 22598ac66286d60f…

MALICIOUS

PDF

149.2 KB Created: 2021-07-05 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e994a0d992c6d12dbc4f1571ce9ec0e SHA-1: 0be3bd33733c330a19c166811d33eaa8bfbe078c SHA-256: 22598ac66286d60f34265a7f278c3fa92eab90063e2e325b3544857b742965b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af7703d20---99700083136.pdf In PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/lupujakewesaruvagudog.pdfIn PDF document text
    • https://brod-plovdiv.com/images/98804836291.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f12d28b5a---64416964749.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11002dfa14---3461780145.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xoporep.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b00dfd67---16420554861.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/metixopevuferusewevuxe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9cbb47f5---kumeritefanotu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d67c8f28053eddf3045eed6913f8f839/xopavuzepugofuninemuz.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3fe0da99eb6acb8c7cdd46531a8ea29d/luwivo.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/63336935867.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/fafatavokojuwadolatuwa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0d001942---gakomagetuwudojovepimep.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/15675079330.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071a19caa69e---31337009112.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210619_278E7F50FFDEDA14.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/givini.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e597rr1k8qkad8msbcga2ev4u1/tibiviworel.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/36903872119.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a599712d69e0e1368ecfa361a3fe6c2b/xefapovizober.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/19643524000.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/93906807873.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/wukowufelode.pdfIn PDF document text
    • http://inistor.com/ufiles/files/kuwixepelupoxobepixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=freddy%27s+pizzeria+realPDF 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_off0001e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9C3 17632 bytes
SHA-256: c85eb95a41bfc62503f36ddd199ccd4e1daf93946005a33d096aecb079cbf067
font_01_sfnt_off000217e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23000 10248 bytes
SHA-256: 67fc704ec5b871a45802f3623ae72b05a008801aedbd5ebd136cce1490e21c85

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