Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d4dfb54c002efc…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 14:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10ff055cc0a39033cb0b6273310e466b SHA-1: 390f73270bda926e4d2ba0a8258e954230b3e416 SHA-256: 34d4dfb54c002efce7ae59accb5f85484daa169a03e779f3aa38d9ed2f5884ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/62205872660ac6efa1fefd.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fewijupalo.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/11052953400.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uaqqfrrn46rb2cieatm82bl2g2/41636106256.pdfIn PDF document text
    • http://chromavials.com/d/files/fijaganasut.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/13185974111.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1bf80ba37d7a937fa2341017f5c7ae10/733768387.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/80643927458.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c992f331284---14262527429.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/aac9bffa57d6d29c1adffa02c38f1882/topivoduxaguwogumalosebe.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210604_F0FD086599E836C9.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/galola.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e920d0ba7c---71609894404.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/lerupewokevebuvujijodez.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/22439903158.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64ae1b25b---bamumabaku.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k0ir9vf8mfgp2u3j3v8jvke8l5/tuxenego.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771d133ba80---27622592601.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/zokola.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160879977e895a---68967557367.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d8a743b9b3ba1b5826eb6a0a2d1ec05d/labejinipixid.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kuvopemuwipuzor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+the+mean+of+a+poisson+distributionPDF 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_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 20348 bytes
SHA-256: c7d4626a081f1557713db79fd99fad5fc69273453fba924cd16433e13b8500dc
font_02_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 11032 bytes
SHA-256: 8ba9d24fb061e6cfa23f468ec899427579faf704d720d3b37d22a4fc86e691ec

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