Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79c9e38590573ab…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 20:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee234edb8445ba70e0d9f12205143b59 SHA-1: ff97755b6516321d5ad1afde543eaca30149b0f3 SHA-256: a79c9e38590573ab7200a81fcee6d2d3be0dcd1ab05c53fecbbac3af7fd380fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1edbc12d045136001050ea003429cc18/sipateridamil.pdf In PDF document text
    • http://rymwid-training.com/userfiles/file/74647778390.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/adv6gbm6imnkq0ctog1cog7a06/funuv.pdfIn PDF document text
    • https://stotex.rs/files/53204162687.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/13303641951.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/82a70c3da108718ce38649bb28cd6125/70141818996.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/bogedesazesunojajonuja.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/r48cubeijh6i8ek87v7i1ioep3/kuxejatimogamug.pdfIn PDF document text
    • http://specimport.by/files/files/biliraxo.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/28897376711.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/59458920436.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/44421471330.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210725_DEB90CEBD0009D64.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/saxuliwiwaziro.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/denoxigetuderosedusofuzob.pdfIn PDF document text
    • https://emmaushuis.org/pages/88114231483.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-13/20210613065258306219.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/62505067349.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/bfdfics1vrab5r73tv2hvpod06/wokomogazivuza.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/35957277064.pdfIn PDF document text
    • http://iltorg.ru/upload/file/96989086732.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a443c05c58---kigigowu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c193fa0a390---latedevuliretos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=solidworks+simulation+2015+black+book+pdfPDF 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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 11572 bytes
SHA-256: b36b084c2fab7142d9b6da6622bacfebef724009a89e6fc42b71c565ceaeb5b0
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 19252 bytes
SHA-256: 565451bfd9efcf8d09819dd6c7332e9a98e5bf8ab14d256abaddd68523f9e67b
font_02_sfnt_off00013a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1