Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c5c14f161274b…

MALICIOUS

PDF

85.4 KB Created: 2021-07-16 17:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad45b9a7198261dd68d39b727005aaa2 SHA-1: f089fc186a1eaf1e3d788d4eaf1e5855f51e34ad SHA-256: f37c5c14f161274b1ddaf0e71485742e3cc3a353b8b678ea62299ee8102ce7e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is used to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://schilderlesvakantie.nl/ckfinder/userfiles/files/18608125890.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/20c481b43d8fabdeb63fe720226156ce/lotafakebopajaro.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f746eafb1---tixapuwimegudum.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/50fd799a1fd814809116cfdaf1f3a52c/20591729616.pdf
    • http://abwingssuffolk2.com/uploads/files/44579967342.pdf
    • http://makesomenoise.hu/upload/file/75692660631.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdf58763c---76668868958.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e87559729---pazuwaritasuruz.pdf
    • https://facades-metal.ch/ckfinder/userfiles/files/fubunikafoba.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4292f9ca76---36925031747.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070e13b6f647---tirejujose.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/r8i7igrv3uup4atkn57d7bbqj4/14035766406.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/kubibofuvixavineja.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae232d465---moxomegot.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/754bee5f9f0fd16421e044674a560815/koberupijakoxetozi.pdf
    • http://braciszewska-klimek.pl/fck_files/file/wutimijedeporojep.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae888798556---53618714469.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f78bab4985---wemizoxolo.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fe7cb76158fc26523f2a0d637d8b0828/23210801395.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608074a18cd21---78439840701.pdf
    • https://nepalonetours.com/userfiles/files/punutejobubipekanodimi.pdf
    • http://allycatering.com/userfiles/bupiwurebep.pdf
    • http://www.ecostroyservis.ru/File/64782527638.pdf
    • http://filtrydokoparek.pl/img/all/lubox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=full+body+stretch+before+bed
    • 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_off0000ed2c.bin
a1458c98ddc70f41164325dc63f4ccda057f14bfa49de64f6aff1073c7f4287a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 16488 bytes
font_01_sfnt_off000117e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16792 bytes
font_02_sfnt_off00012fff.bin
9c580507abad98b656ae6991eab632787d76631eace63e91191137926e9c5bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 10548 bytes