Malicious PDF — malware analysis report

Static analysis result for SHA-256 7512184bac09c6e1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 03:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51f5a3a58a81c3ca5888bf5502ae70e1 SHA-1: 9224eeb1e2b0a2b5fe24cab866dc1546d480427c SHA-256: 7512184bac09c6e1e10fd7654c1c2ea3b5023f1878c77b89ac96276f13ed0670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=miss+sloane+watch+online+free PDF link annotation
    • http://adas-muko.pl/photo/file/39605767612.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/54547944761.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/digezitiragivuxun.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/57375064129.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b759d79fbd---66976483242.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/woxobitel.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/ziwejavitu.pdfIn PDF document text
    • http://tencanpowder.com/d/files/41506732215.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/85593127335.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kusanabokubutetubevibod.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/nadekuferosadafif.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5a92bcb44b95ce7b6650267afa24b3ad/90575785118.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/66598572355.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/95568758744.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/42802444152.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/64645975634.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/jedat.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/nemejofekar.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161387a0a13453---26400164357.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/girasapimewufop.pdfIn PDF document text
    • http://mastervin.ru/files/file/pudusezikametezu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/245c77f77368643692edd3cdceaceeb4/73633468192.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/xajatazatejarud.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wogubumofaxu.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_off0000b2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 10512 bytes
SHA-256: 560a1ce660515d417f980425ed92ab0d5efb5f73465dca77ec54ce153b428d27
font_02_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 15752 bytes
SHA-256: b8c3d8f2c0319bd9b8d4d48487061b634f2726b8b2c76226ca68770ea1acd72c

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