Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc97c342c65e9598…

MALICIOUS

PDF

98.6 KB Created: 2021-06-27 21:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b80aa37fb3c0a7d187d362f369829e4 SHA-1: d1c54d2ae751aecac6c01d7b02090600be0e7104 SHA-256: dc97c342c65e95986c1c0b0fdefffbe8df7ae69ae7fb17af317732a8e06d598a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress upload directories. The document body was unreadable, but the presence of external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://coretry.ru/uplcv?utm_term=a+moveable+feast+chapter+summaries PDF link annotation
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ddf3b82---10812838606.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c4cd5e61---kifamexaduzubitop.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050314555011.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/97244468476.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mixusafedubixagenotoruxa.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/17646617825.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/butazafarotazebuvusirug.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/15911922289.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/modolowolexozi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tbs7uhdg27qlmv2ja2bbogm03o/bofowixejuz.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d4153aa5---sizilafifez.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/jufuko.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf0876386---tigamaxoxivufetirike.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc444d7f787---kuxewidoxalosenabajijipep.pdfIn PDF document text
    • https://shopabrang.com/images/files/6571328077.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4b0d21d0377eccc909c0c34965336dd3/98791530432.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/505b57ded34b3b08e77527a9aa498d4c/dodozoje.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0b8d22da39dda2f17bb32449d2dd3c7e/27665628564.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/sezojaje.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/hviuq47orb7trapfnio7jei2p7/43856106228.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/48928629978.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebc6c15ee---pogegud.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ltj21pk4krmucvdnvlb6lc5373/papepejumejofabe.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/88472874436.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_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 10928 bytes
SHA-256: 25b15fbfbb1ccedc6250ee30b7ef0f6738eb37f54165d30d1193bb881e78409b
font_01_sfnt_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF4 17724 bytes
SHA-256: d46d345b6f16071e0cc66ae1b9fe7a422216daa70fbf4a54956ed06a754daf7d

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