Malicious PDF — malware analysis report

Static analysis result for SHA-256 a517aeb2df062e13…

MALICIOUS

PDF

71.6 KB Created: 2021-08-27 15:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6ea9177bdd278a2f31c05eb174871b0 SHA-1: 8612900761cf79952aee1f25c849777f4e96cba9 SHA-256: a517aeb2df062e13a51f39d3d0c286007a329192e6f65f2b8c286a55eb932329
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=find+and+replace+color PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/a8l0emtl6bo9i24rigq724eqqp/bapixebitexiposekix.pdfIn PDF document text
    • https://landi-bg.com/images/file/75315810537.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9epk2e8o5cl38rqndvs7v1ci83/viregafekaparisijobejuwa.pdfIn PDF document text
    • http://seamacros.com/upload/file/fatarofinozozapu.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aa06e7ca125d44ab5d83b71b600c6a7f/bujugi.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/14283706725.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/gotadigotupepakababuzudum.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c909d8a7d5d---71284775617.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9bb83006e37a7b0755f6a5d2b5b612b8/36786376284.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/16159398929.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607223be22691---24831103479.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/89750306153.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/manoratad.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8dffed1f5---kamipazuxibiliseruxajubu.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/9445808175.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/r4s4kmff52rfgpr3n29upc2op9/disogijiriri.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/zejotubajonunasikakuze.pdfIn PDF document text
    • http://sparkpro.lv/content/file/tujeguduzibezigada.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2rl52gt8f6t8cjuva6r19a33k6/toxedamarusafuviduloju.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba6f6c51a---75680397333.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/gaxiropovelopos.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t3fvai43fmm42do15ejgfs3smi/gofipusokenavexomuzax.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765aa7e09d7---62571083568.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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 16156 bytes
SHA-256: 9ce9bb01449f7bb3a27623ea64bbbb47627e36c2d68d1009cd3ffc73fae49c87
font_02_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 10216 bytes
SHA-256: 65e036aee216bfef44b6bad42737425562bb03684e6880f702745a57c8280008

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