Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e509b39cdeb445d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 13:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b06e236bca2e54e20112556a3c65c260 SHA-1: ab5656cd609e48079c87e549e4141b149d4dd2bf SHA-256: 0e509b39cdeb445dcdb83c01bfc40760a2e5ff0e317647dbd00f9d2c94e2734c
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 malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=cisco+asa+firewall+pdf PDF link annotation
    • http://geteffective.biz/uploadfiles/file/zapulabazixanubuzafa.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/nosumejekijujeleta.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e192322c7f2---godegawenajebelisazavawat.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_215810_103.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fe7b420e8---76707628891.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/76938455299.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/34304633159.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fopuwaninuxatesosunar.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/28978350795.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sulijuxazefazorujuganu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/zadoberamozonepudepip.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jolez.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/wisovurutavuledobozi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b5dcf208f9cc6a8dbcd791fa5d157c71/20122965641.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/96579289865.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/83541434273.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0cb46601f7023024ab19a33620d88da4/96007406428.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/bisewukabi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607991ce261ec---telorugodaliteje.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/kujebotax.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b5595387---6433685389.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jakisakugefibasevusileg.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813dac60d6d---29788701378.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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 10528 bytes
SHA-256: 79440a18e4f92a942f4789ceff22d1edae333e33883b7b328075fac010d67fd0
font_01_sfnt_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 15532 bytes
SHA-256: 9571db54c65484a1a59ccaf5b6ca45a65fb9103b9aa58ec55c416092c4d15c04

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