Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c04d4e06c0092c1…

MALICIOUS

PDF

71.7 KB Created: 2021-06-30 07:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38d2a051ac06ba9e5efb6825d5bf2bd7 SHA-1: f66a18f2cf11a6ce9ad5da48154a70c15770ac2a SHA-256: 9c04d4e06c0092c139487f0108f11436477b09ffe427b0f96c99ac031cc465c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://angelcabrera.com/FCKfiles/file/20086577937.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/jefumujezufi.pdf
    • http://weberstellen.ch/userfiles/file/86259680869.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7c7e8aa792babe0be18173876043caeb/pejunolujiper.pdf
    • http://abnicum.com/files/file/wamegud.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087544ddde0a---ropupuzobuwo.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zoxaturoturezumex.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364727938a---tizojolugevisanu.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1fcdf28e---laxazegetapas.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/78088629251.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/aflgk1vaatjuhsfs28db6cisq5/84514505602.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/99a55e2f6fcfdb8b3f0ebf0c8955b3f5/32713799260.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/mizuworus.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da740e3d18---10428331653.pdf
    • https://abofahed.com/userfiles/file/medinawop.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lbtbupmqici9srnlin8i3tjl66/72633988598.pdf
    • http://alexandraharris.com/clients/36054/File/75907045023.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f6c8d39ce0979df34a82530b1b98a100/86706874077.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c988b0214c---45331379442.pdf
    • http://alpha-cp.com/userfiles/file/koxuxotemagirawimed.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/279toqs0bee1kps6e94795cbgu/misoxogenojonuv.pdf
    • http://mgocsm.in/userfiles/file/13218802546.pdf
    • https://verandapattaya.com/userfiles/files/10439196362.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i86cibrag6ks3bghjoclr46l8o/27923244896.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fc87488737a3accbd4bc24449723a5c4/wuzasikivawadabivexar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=polokwane+mall+of+the+north
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b825.bin
51e59d8b4c64c79bce3910a45d80ceede8a8266453d4ee87d54911e792bbf093
pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16092 bytes
font_01_sfnt_off0000e215.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 16792 bytes
font_02_sfnt_off0000fa2c.bin
ff0cbe6c29f511dd4a4a81c5a9f95adb120e2eb376bbf5c7736b08f5974a436a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10396 bytes