Malicious PDF — malware analysis report

Static analysis result for SHA-256 76640f3ebb4e9b33…

MALICIOUS

PDF

85.8 KB Created: 2021-08-10 20:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 513d789999aea59699c5951a36972609 SHA-1: 69d81b3da27c2a713157eb839c6b134356030930 SHA-256: 76640f3ebb4e9b3312e2b44f77affe19c995508dec2699637251febd19485187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, rather than executing code directly within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7e84fb2aac6abaa526cd7444fa9b299e/84046416026.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3dd0f959---ronuxisigirasina.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b14f23b6---27077739972.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/20053696656.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/joperamasatikubebu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/96975853970.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/lelotegaf.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0fb15e99a3745c2d2773d848562a06f4/37734522671.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e54e8b7ba0f---50331631415.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096f80f15eac---xofuwo.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/81096575944.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610dce8eed396---38069689705.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/dutatesijeza.pdfIn PDF document text
    • http://voijin.com/userfiles/files/jezikaxiraw.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/66016305887.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec1c6c6d7---sirekutisuv.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021073002193273499.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/miremudoz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1891a7b2030612901a1b16e25b5afd02/27638509818.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160828e0835328---18145897700.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/93975670258.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9ee368670---8120010626.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d60eb15e---sewekedipodirabafixul.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/vebijabutabusemafaz.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/pokepamikofiwofuzeti.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d79304f7b6---mopofegiwiditajone.pdfIn PDF document text
    • http://www.bash.cl/media/file/gapewuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+microsoft+store+on+windows+7PDF 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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 10764 bytes
SHA-256: d7cc5967d6606736d64ab12e1d6ce4ec39b7418f93a9152b47f50416c529c3e8
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16744 bytes
SHA-256: f94e8e39d63b635f8582f6c9157835cee07c5f4471e14e68b0629f54b895a590

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