Malicious PDF — malware analysis report

Static analysis result for SHA-256 087dff248a14f927…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 17:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 686cb2a954ffb898d4c4dad7fb9c9538 SHA-1: 781fe94b5ac2564dbf89668ac6fa43527b2230e3 SHA-256: 087dff248a14f9276ecaa4a64cae356483bebbb2d888550673a8e0bbd9b7dc5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608574c1e8490---gerone.pdf In PDF document text
    • http://cesurmakina.com/userfiles/file/5230974906.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/winuzopemifi.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/40221674470.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fb05cbd1e141ec4da9b4c374728ccf2a/36944011410.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/kaxej.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/v2svi956aqhgn6s9e3sl6633t0/63880969755.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t8m9sgj2rtfbv3f9hmism6vg51/bigel.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/45452486041.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/faogrnuulhi1qcboqjmsnb02qu/72182123288.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/13450282050.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tbufp8g8cb6r3vat2s49cm7291/75069628925.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v7ftnbgvsqfosh106vptqrsok8/680736166.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/23aa774faab4ca551d82b07f4b10db5f/muvirilokabaj.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/f37d2925f213f281fbb8146101ace9a2/tuxosenuwomolekojapek.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/jizogaruje.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bibeleviwofolafun.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/770a205cd9463a3d80d41737d3052d15/tegaxanogu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12cae5e31---35989669976.pdfIn PDF document text
    • http://acril.ru/ufiles/files/rutifamakufibone.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/dobobelupoka.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e2u3oi3938e74mo7663plp6fab/siwufitepa.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bitumenazukuxer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=premiere+audio+and+video+out+of+syncPDF 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10872 bytes
SHA-256: ec5dabaaf1414ef8d26c638c1db5dfe836cd83921084357029988048b7d9dcce
font_02_sfnt_off0001179b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179B 17324 bytes
SHA-256: e0111dfb5f30def8ad2f4e4375e98cb7ade90a1f76291e333d116fddf038c8db