Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f531e9db5b8aff6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 06:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5bf32801dfeb38f5d2f66e84645d5eb SHA-1: 0d45af830c709ab5c8ddb66e53015e74e83e971f SHA-256: 1f531e9db5b8aff60fa70e2c17d6c82e067da9f7cbf304917467da188f74af41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the overall structure suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=french+made+simple+eugene+jackson+pdf PDF link annotation
    • https://luminex.pl/upload/file/misisilu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/gfo9k3qhildgtmjqvuh8han062/65861542402.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/fesux.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7536ac3e30---jovolenabizilebotusadu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa813299105---kawepajezeduxo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210701051156168.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0ba2dd2bc99f81935132c69db2f744a8/zilota.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608326ba16bb7---30664178827.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31096cba8---87728482183.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e929fa9c6f8---26325455496.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/momev.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084530506a21---pefedevozoxavekam.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135f4be9a1---14564076310.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/ribetopefufe.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/74568778662.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077481846e34---92734559465.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/limida.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u9kbjgjcbc2f6n6s1ltu2tb7u3/7158681104.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/devivexaperulexosavobu.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/342414758.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/faee36a2d7fe1bf85d96508b9e6f88e4/ganakikareboxegemuder.pdfIn PDF document text
    • https://soechi.com/userfiles/file/27308926473.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/50869885201.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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 11268 bytes
SHA-256: f498f00cf9cf81fc8c3928de15a7c658c34d275c7519aa78bd65baa493427e4f
font_02_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 17592 bytes
SHA-256: ba755031624182ce65e3bda1581d712ce1bfca665a33baa086dd24c990d21567

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