Malicious PDF — malware analysis report

Static analysis result for SHA-256 35192674bf223714…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 18:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 064b00f8c022d5cb570a63aba7a4b37a SHA-1: 8f315522c221ec41f17870134b6b42a10a740ba6 SHA-256: 35192674bf223714c6229d4bc95ed5ae0f9209142e40c096dafbdb6dd53c0ed9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised CMS upload directories, a common tactic for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these compromised sites. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tort-art.ru/userfiles/file/zovoruzupetatoduf.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c3ghhnc7aegkn3o6m8g15g44b2/58994406678.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3bca4f20---bepinotuzesawuxapus.pdfIn PDF document text
    • http://hzqzg.com/d/files/nodikoxosisapadebogipoxef.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/nuzozulujibevewegidovev.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/175e0e87ecb519562c8a48ad5eb8c7c0/vexefuwaponovawododub.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/teviz.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/31141656109.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/kesoni.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-05/images/files/80636399964.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/31264163067.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d332918c2---lowuzavesosetonanasip.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/jasixogugujajezimesebamaz.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3667563e84---jediwake.pdfIn PDF document text
    • https://digireg.ru/upload/48648961880.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/nivodixarokatunipomod.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160828f0b1455c---jemenivaxopusugarobuwusoj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a8c16ae658fa8ebb1016dde6562eba65/94580751341.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/jotenizi.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/siviwelugudenevenekavo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/6212738442.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/47250389965.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/79155191811.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210808154248.pdfIn PDF document text
    • https://ms01bet.com/contents//files/salelokolegorilapamenane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=surebind+system+2+manualPDF 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_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 10836 bytes
SHA-256: af492e779720a39a65ac8acaaf36ecc8301f1d689b64a574dc2748ef41fd7595
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 17084 bytes
SHA-256: 177a03a41b2cc9633dcaefb808e57be46b95bcbb8c2333cd94cd648289f0ff85

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