Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc3f45dffedf7d9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 17:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d41f438e2701351f5ce5a33b00c9d83 SHA-1: 21d0d421935fd621202f5a9aaa7e5a81f3767a46 SHA-256: 0fc3f45dffedf7d917cb7589625c47f246504da0d49c0d1f7fbbc37b9c00c886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/62820096647.pdf
    • http://ct-tci.com/cttax/userfiles/files/dagenog.pdf
    • https://roarmysecurity.ro/mm/file/zaxagusur.pdf
    • http://moestuinwebshop.nl/userfiles/file/12285538621.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3b3214eb5265742f96f55e1f9cdc895d/78644621944.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852735c6c5---kevulefadilepav.pdf
    • https://actaviaserica.org/board/file/files/69244455372.pdf
    • https://oancora.com/ckfinder/files/nunis.pdf
    • http://nuovojob.com/userfiles/files/subarikevebenev.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ju9hgkas45k6dufg48b1cum1g1/76499126163.pdf
    • http://ehomeforeclosure.org/images/file/66294579740.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/54561393492.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/25051576676.pdf
    • http://pro-group.ru/userfiles/file/23741721345.pdf
    • http://skrabl.pl/www/rpbd/fck/file/miwevepot.pdf
    • http://fuguchair.com/upfolder/e/files/20210902023232.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/53616804856.pdf
    • https://istanajpdua.com/contents/files/sopal.pdf
    • https://airin.lv/images/userfiles/file/54810073649.pdf
    • http://pallenberg-busreisen.de/uploads/files/93488202097.pdf
    • http://faurau.com/luodan/images/userfiles/file/50243316184.pdf
    • http://skrn.cz/pic/file/2233154454.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb5d642d5---59103595232.pdf
    • http://scpt.it/userfiles/files/43547517517.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=clock+sync+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d869.bin
64f06def09ac35c90d0e75785f630b0f9cece7dbe33110eedd1fbd1861dacfdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17372 bytes
font_01_sfnt_off000105b4.bin
c6ac47da92eafb4c269dd355dc1eda845f64fe3e172e9d4f2f392362503bf562
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10184 bytes
font_02_sfnt_off00011cb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16792 bytes