Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34f6d3231a88cf1…

MALICIOUS

PDF

104.6 KB Created: 2021-06-30 00:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f79b5d579c8c5ec8ca58028e477222ed SHA-1: c941e9df8710e97d10cdc0ecd0118c81d6a6e7fb SHA-256: a34f6d3231a88cf10d89cc2eb57202e764d64837b769a45b83988361cc0b9b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. The primary attack pattern appears to be a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. No scripts were extracted, but the PDF structure and numerous external links suggest it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=radiolucency+at+apex+of+tooth PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a31376c93bb---kopafebarul.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/97061039995.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wogerudonakuxem.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mv296u7952f99v0i1nphgdd5a4/12981838764.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca508c07e---70917927258.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/dabaletawetanomosepide.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098690bd2035---motunejudopiwusuwagoma.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/piparisetoxojemage.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/dd7e5e47e9ab4b105b9f3d985feca29d/16508555441.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/49079845981.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/83482596277.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed9a0122a---1655366237.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f51d5bea---81255735389.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc734cdd59---23615575489.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/xesevesikejizovezufe.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4f38a0e90c966a73da2ac9f63296790f/mududogapuxoxezuvata.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/70862206439.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091496581678---60015565055.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a602362be45---65716184936.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/kr0j2djjpbas2mstlb2o7l3gem/zibixu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55bee013b---58951827892.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9044f41ad5778802e284ad31f36aceef/13891672323.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a80ed9295c4ee7348a497d8fb368ee43/wejim.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_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 10812 bytes
SHA-256: daaf5bfd0539476989fabf6088de03bcd76e24c639a2cce9f51bdb1b5b26761d
font_01_sfnt_off00014eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB4 18096 bytes
SHA-256: ec6f3678f941fad168b4b65bc54a8fcff2cc4b3e0a6b2bea9d4d9eb2ee40bd3c
font_02_sfnt_off00017d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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