Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e9e655f1e1ab6a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 19:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12f209166119300e5501107bd91972b3 SHA-1: 748f81221cbe6f90095587e782f6920abbfa9cff SHA-256: f5e9e655f1e1ab6a293c8551466cf2ec5b8cbba15b990dadd909d9f8f1013b9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The presence of numerous URLs, many hosted on compromised WordPress sites, strongly suggests an attempt to distribute malware or conduct phishing by directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aftp.bg/userfiles/file/dipazodeluraxozefefiwosug.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c942ee62de---57056690178.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/4588222654.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1db943c7---50990254878.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tubobivirabowo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/51t0evq70d6s9ajjta5nu6qb4a/87509864189.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///86624501558.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c993bdc835---9078177439.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/51211605680.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161380152288bc---65541412215.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/navixejesuserebi.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/nijijipedodanevafaxese.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041608093186.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/69362853282.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/77400737513.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/49435044966.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/45744625447.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/jitaveratomoki.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/tepupepowetajozebuzinid.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/siropowe.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/72275823035.pdfIn PDF document text
    • https://ibericadearmerias.com/file/vogaxal.pdfIn PDF document text
    • http://machulski.com/public/file/mizogukavidure.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/dezejigiwefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=play+fall+guys+onlinePDF 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_off0000c187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 10408 bytes
SHA-256: 1b33e99ffaf53975c94542cfb36cf6e56f269b7df45c1d8afd3665a67c8c14c0
font_01_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 17636 bytes
SHA-256: aac1eeb2858320f27443333f55beac990f3d6a5f1c84753057221c596888bb98