Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0aeb5363ff09f…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 07:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06256ac330ddd05244e28e275a4ccd73 SHA-1: da226fecdb70a2f6f14edf97338e7136fbf22883 SHA-256: 87c0aeb5363ff09fb3152ea027aa350094b3f5dceea596bae1025021e8fa2c57
172 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and functions as a link farm, with many URLs pointing to potentially compromised WordPress sites. The heuristic 'SE_INVOICE_LURE' suggests a phishing or payment scam pretext, further supported by the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa9741650a---foxov.pdf In PDF document text
    • http://bawaconstructions.com/editorData/file/ratafoxalemubi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868edd8cd8a---majokatukikiwabepu.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/niranadanomitetedabom.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/ritekori.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2as1v6n0dodo40tk8hvdd8oee6/37384781195.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/2642106392.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7db933f11c193b65cf6afdf1b80aec9a/66539003861.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/69137789204.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/82e9182a7def521e5ca2f474dd557f8f/nobiretufivop.pdfIn PDF document text
    • http://askort.pl/Upload/file/vasunupipir.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/zorifexaronetapirabefuk.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/bowikasagifi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/af8d7ae20c0bcea6b05490ddcf3b1b8f/kizukajevimuxewafimov.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/18cajfjvj0pvt3tjmli67mbdr2/kupupevafafexadar.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///90534853819.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/62252522866.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/805b40759ec27d00677bb97643c6e0f2/zekoterolisijus.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/16762636564.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160766c7489f86---55232725071.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/66561728594.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210603_94D318CE32C85E93.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081105c2bdc4---35474055177.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc846cd8b---73348157665.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f1f47f4a6f28593b9832b402740281bc/futonisubenozokufuvek.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/lkrf5tvf8jbukapikp4cru3vd0/gemojufagovemimurewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+business+practices+for+photographers+pdfPDF 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_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 17956 bytes
SHA-256: f6d5b6b26ebb8a0b174c06284478f721ea3b7666e2368bd3ea8a4fc986781332
font_01_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 11144 bytes
SHA-256: d7c791a0d90de7a1b8a06734f934dae6250c3889490eae80c4c18021bafd24e7
font_02_sfnt_off000141f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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