Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3c1614c004d6cf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 18:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 021921264d5870cc02df769877194a9a SHA-1: e23911b14cfff7ea9e4a1fdddc4f9d4ff9b25e5a SHA-256: 0b3c1614c004d6cf263c1091fe4e987ccf4fa80c05ebb47b94005ab4eba013ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to download malicious content. No scripts were extracted, but the presence of numerous links on compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aarhuskortet.dk/images/file/19651146557.pdf In PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/zepolimaguxomimikavexaxe.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gaxinadel.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/13b742fe23cb0e815bf5daf2efd2c6ad/dokubamokuxasoruvazuruv.pdfIn PDF document text
    • http://tano-cable.com/d/files/7949631849.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4417ad9ea25556189e1a5650285360a9/96489576710.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210907_02FF9569E0996DA0.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210907_7C46C02014B2126A.pdfIn PDF document text
    • https://southafricapools.com/contents/files/vibepiworibupepafubedow.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/46538365522.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/zubojuderefuf.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1064cefe6---293811550.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98384400161.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7077f4bc967df8dd07c75ec7aac71e24/59666613838.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6813965c8---76239484124.pdfIn PDF document text
    • https://zagi.hr/files/negifiba.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/gapojowesufuzutejuv.pdfIn PDF document text
    • https://value.ae/userfiles/file/nenugixipivazuxalewolazoj.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vevifiriperemikafavabuxu.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/16180633197.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/zubezunozimipukagamawix.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/37851958774.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109061824288373.pdfIn PDF document text
    • http://ave-france.com/pics/files/nenuwiposuzozozoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=imo+old+version+apk+free+downloadPDF 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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10756 bytes
SHA-256: c9c1c965b59dfafb884fc7a0766072488d97f744119447cb6c0e0daeb42a20e4
font_02_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 18784 bytes
SHA-256: 421722218a72592cbde56acba7a37d16d908bfce74be140567beb778bd52045e