Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b9cfb689999017…

MALICIOUS

PDF

79.9 KB Created: 2021-10-06 09:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85686d5728c88137ce3ef51546d1c3ec SHA-1: 66ae91b541df4f98d70e08f3ac0894bc52a3c1ba SHA-256: 14b9cfb6899990178d01b24c4e44dc8dc482f9aee48183ca6c4694b1c8614c2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=android+data+recovery+apk+pro PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/63df5604513704b1a1637897f7c84ada/tubudebo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/wutevemuseg.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/50727216902.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411b76e7b46---kebitiwoxaz.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/18020468380.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/papijawowexi.pdfIn PDF document text
    • http://onlinevay.com/upload/files/830456967.pdfIn PDF document text
    • http://mebco.ru/images/file/10906764833.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/zobeporogidavut.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/litep.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/73765547723.pdfIn PDF document text
    • http://e-menu.hu/editor_up/gedonopokiwivi.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/99387947959.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/5839013605.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d168a74e94---duxuvujotejezefa.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/pamugekuf.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/mogizitenew.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a2a087d2d3d0eae21293003ec31e9aae/38013335971.pdfIn PDF document text
    • http://mousike.it/img_ins/files/37109093267.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/78970519631.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-28/20210928143605492431.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/nakunafaxukototefivobi.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/samoxezuvad.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/nejos.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/wizivuxuvapavib.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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 10548 bytes
SHA-256: f9b62e9e4319a3098cca0503e1fd2000b4538a95f093e29ec0517880a2d00ab4
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 18136 bytes
SHA-256: 0aab8481d0aa79ecd1b9d1e3c48be87b2827b6c619cae7594ffa2abfd443a87e
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1