Malicious PDF — malware analysis report

Static analysis result for SHA-256 d691a3ce95e97dd5…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 04:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f84c2adad73bead3f5dae108631d9162 SHA-1: b570e312aa8bd5663d6544a32bfc8ffd8559b498 SHA-256: d691a3ce95e97dd5ab6bb3efecf38b5c04689c35a7eb9e9ba40c47ae40cb34d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely directing users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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.
  • 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://amandatravel.com/userfiles/file/sewijufakisivofe.pdf In PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/94525839878.pdfIn PDF document text
    • http://flexa.cz/docs/file/35493498972.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mafotinuz.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/tamodabumiwikix.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109120022589102.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xifewebelalopotawizap.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/turekezi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pizasupivogelojew.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/94220102215.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wurugowagetitevira.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/riwexukazupuvikon.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xebomelezuvolomegivagis.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/gorilanojutuxusiwudorev.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fb4ef786ba111d3ac662528eceb19365/vurafimemoboworerekibaze.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/33403201826.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/josebuzanovepezuz.pdfIn PDF document text
    • https://tepihtrava.rs/files/2533759232.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dogazepulekep.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/11695069816.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/58484356131.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b592f70563---21646524608.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ln2lr2tu5u9s9mqllbefvkpg52/lukarijaruwasizazamom.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/54899052466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=4+letter+word+starts+with+wPDF 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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17736 bytes
SHA-256: 74a6013be7087347e9a9a6c40285d223f126b0edb647831700de4e73b559be36
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10308 bytes
SHA-256: 5704342864161a9d4daefe21610a408c8fc93e090de45e7d1e0537699f794622

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