Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc5c5777e84dbd2…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 20:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a863846401be24d9f87386f82c4b9e1 SHA-1: c4e759d1444059001d9106f34f3b41d05ceef653 SHA-256: efc5c5777e84dbd2b0025d4b779f8f464df4c44668049bd5931461919630229d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6e375d2734da97e19c6f6fddc3d8908b/15449945766.pdf In PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/95057470599.pdfIn PDF document text
    • https://ka-base.no/images_content/file/76693091498.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b74550985bc---27315596323.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c0406623a4ebdeb3a20ff462de5f11a8/76970660565.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vowuwunozazez.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbe5daf6b---10554831475.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27fa90376---geluxidon.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4120c00ddf9adf703b13da9b79939ac0/levem.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0dq9pmj7mup2966itpdn8socpr/18819498663.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/96913313771.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/sumejavoduf.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/jamojasaravet.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3e2d776f---vofuruluva.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/56597700950.pdfIn PDF document text
    • http://classtool.info/upload/files/50122900144.pdfIn PDF document text
    • http://eichler-kammerer.de/89173406366.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/68150012654.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/15978612434.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xazuwodujobogogimojome.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lk81n7svab54bukrh5ontjqe91/8060939069.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/juval.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/geson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+free+backgrounds+for+zoomPDF 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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 17132 bytes
SHA-256: 70803a296c509e3d28badf4a852f17168a2f2b96378aab7bc889249c0e6ce471
font_01_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 11152 bytes
SHA-256: 6875450a918bd82ebfd4eb3e556b552d9f467fcf12fe4c8235097b629924cce3
font_02_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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