Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bc44b8ffc845e7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 17:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56d719cfea296a41369a46a5dd9d524f SHA-1: ed67dd8dc559a7cec94ca377ce8c332ae317d694 SHA-256: 58bc44b8ffc845e721f20a1eaeb543f9f379211c2d726fb726bed2f474f82f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms, forming a link farm. This suggests a phishing or redirection attempt, likely to deliver a malicious payload or lead users to a fraudulent site. The ML classifier and ClamAV detection strongly indicate malicious intent, with the link farm serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lfvfqofqe9fcgb0daa3hhevo33/13469691000.pdf In PDF document text
    • http://sabaispa.net/userfiles/file/46880712611.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bc0c6320---73490465090.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61541827326.pdfIn PDF document text
    • http://tykhchem.com/upload/files/8731710469.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/pixawobelewuniximagomimu.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/45930870098.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/92594678422.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/90319604166.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/88865233096.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/xodikopoposelepusirulo.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/risavegikitelilolukudob.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lawaberik.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/nuvuzewokesuwekafaxuwuduj.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/89669842109.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/837f8aa7d58b605e8df718c9e17b5bda/74896760090.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1ba6909f644ff1663f3569919cbaa139/17681533036.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nujapudiwerenobekexefez.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912073120.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/90402757849.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c483adbd3c4c3da0126920e44528a447/ruxan.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wofebixulivagupulajunow.pdfIn PDF document text
    • http://vhshf.de/File/buvefezipopajow.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/89833873941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=labelled+structure+of+a+leafPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 10468 bytes
SHA-256: 40dd57df821f0b36cd0739f47943ef937bd18e858bdcb4f1994b38539dd3d863
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16620 bytes
SHA-256: 82c17edfce68e897c4788c0e4fa787242943412997ae324ba7c3985cc6f242d3
font_02_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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