Malicious PDF — malware analysis report

Static analysis result for SHA-256 f418e7d0ab00fbca…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 17:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfbc845d905939cb65ed53d09bda7334 SHA-1: 9f0d8387d77ef36902088f751308e02d573f228c SHA-256: f418e7d0ab00fbcaa06467f194f4745fdd11d6419a7c0a14b4d8c7e2b30d3f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The presence of these links suggests an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://huntic.ru/uplcv?utm_term=android+file+transfer+says+no+device+found PDF link annotation
    • https://successalpha.team/upload/files/92565670807.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/82830268821.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/51558627519.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/06f2284c47a1538d1f1c0055a1cc71f8/23908285127.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tatibomosumeke.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfeb0d79e9---37287469809.pdfIn PDF document text
    • http://vucert.vn/uploads/files/furawubureresivuw.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/titiva.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/50550625538.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614312d4acf8c---33307701074.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/baxenuzona.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392156decfa---gefomawusuwajodi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/fubow.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/6378105839.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/89913660400.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7b5b4eb2---xoredasupokov.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e5d6db8fa7f47c38b0c199b2fa628e35/limowiborumazir.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/jigavevotilogi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612effb302b66---73742047925.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/wepelupexusozo.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/35973611586.pdfIn PDF document text
    • http://rentaruedas.com/files/others/pamekizefalawuxe.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/55844132559.pdfIn 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_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 17968 bytes
SHA-256: fc902cc74b17903b499827b634ba83819eb06423c27a504fa40356885bee89bc
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10732 bytes
SHA-256: 87887fe321f697c0948e059cfd28f0d9e1eb5fd046bc1b43595955ea06b7a4ee
font_02_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1