Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7f7c4724fa9c16…

MALICIOUS

PDF

90.6 KB Created: 2021-08-01 02:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7aac8e416390d310a8726c813dd95846 SHA-1: e48e758c3aeebdbdc636a60baba018a833720911 SHA-256: bf7f7c4724fa9c16e15f9ac9eac7e2bb2b812ece303de47abb281a77f194abb3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous links, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://envigest.cz/upload/file/lizeremakowevonobona.pdf In PDF document text
    • http://ekotop.eu/userfiles/file/fevupukibewam.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/30589122753.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/u9t109ardi7ispkebvaocqf8d3/gawexavan.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/97708523119.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e75df43b352dc3aa0f79cd432d55dd00/10958898980.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6c4e96de94cafefc08019b5704af031f/79778636690.pdfIn PDF document text
    • http://renovator.cz/files/file/6399018327.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/karenivawero.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2uq81eecri3p5q6rrv2ugr5hn2/93871975376.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e56e765---11156144358.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4539b8a68---wefuruxo.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/43906192291.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/bazajak.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/10573262027.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/jovajofumapodeb.pdfIn PDF document text
    • http://benetalent.com/upload/files/83413371008.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/85465a94ffeb770305e0d1dbf3ded213/63419837314.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/korap.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/253bd3a054004620d8dbd7725581d87e/kimafepoleburivuvur.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/6099242747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+incident+report+in+nursingPDF 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_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 16552 bytes
SHA-256: 68360c2bc56207d161767b9cb45977236f25d553af09ad5165631b5df26be8ac
font_01_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 10660 bytes
SHA-256: 4d117cf637144824c3d2be94e4dfae24cd4938d2cdb422d3e2f184aa1b9c5457
font_02_sfnt_off000143c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1