Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c474f3b0669a711…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 16:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc9b193ff99ca94596c2a361eefe4246 SHA-1: 03cb808862470f045ae2ef411391d398a6c9430e SHA-256: 6c474f3b0669a711f2b97d06ba46a9b38e99a5eaa8e7eb3a505f953f8769e1a8
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which are hosted on disposable domains or compromised CMS uploads, forming a link farm. Heuristics indicate this is a phishing lure, and ClamAV detection confirms it is malicious. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://coretry.ru/uplcv?utm_term=jazz+composition+theory+and+practice+pdf PDF link annotation
    • http://geofer.eu/userfiles/files/vimuvekejakimi.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/85240671374.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/75854202731.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23341076236.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/67072588281.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/wafedudiki.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6c4f90a72c2a5faa50ae2dece918bd74/bunitijidobunokal.pdfIn PDF document text
    • http://tipiland.net/upload/file/10573730634.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tapal.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zelonovosusabisatipodagad.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9ab2d4eb75a2a1e4a41bc5d474e60d08/sosarujox.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/405e6f2b43d6d3e68a41ef081cff1c0b/wuxiridubifutiworusek.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/95601769283.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/mejuxipesus.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/zigulivudovunukijij.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/67712629623.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/24830051065.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/jerararemofirakupusi.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/kegidugerukegawubafa.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/36731986671.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906225157805274.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/2224902395.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/81465608311.pdfIn PDF document text
    • 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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16572 bytes
SHA-256: 39942f01c7b3182ce602b7b5d6e0077e099fe77eb88d968f6dbfdf534f026266
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 11004 bytes
SHA-256: fa577e370651fd4bbf60d744e25556f56d1eb880eb8d09b980c1dab836962d14