Malicious PDF — malware analysis report

Static analysis result for SHA-256 832eab1f698381ab…

MALICIOUS

PDF

136.9 KB Created: 2021-09-03 01:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e9a3e3f80d9494b366066a1128c1740 SHA-1: 8a5716cdf60d0dba26d10fe1072c31174f6174cf SHA-256: 832eab1f698381abe2b2f0e8dbe19490511ff44dfa275306218fdecf66bb8da5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and the presence of many distinct hosts hosting PDF files suggest a coordinated effort to obscure the ultimate destination or to maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://novussiteyonetimi.com/uploads/file/jovodujetuw.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9v5udqbfjl6qg5vp2196cci662/dufova.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/69101239174.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9505b3c7---83442644944.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/cdfe869baf2275e6d9e50fdd50194144/wakarij.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/rilum.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/lavuxiposofajugi.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/ce2fac061fee563dbbc076e57f852fcc/42360252074.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f04f0a8d3d7ad5b029c2091da9b99fbf/kawuluve.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/fezobuv.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/vodawigo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/021ed4c0e33efbfa9128bc554cd7858b/dodejorebegovu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf4c64d539---83716933955.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/76708229579.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/41136868915.pdfIn PDF document text
    • http://protok.pro/upload/files/34573727726.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/58353328801.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/sijazezufedegawunekera.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/bosutotejororopuz.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/supiwokovixutulupod.pdfIn PDF document text
    • http://tencanpowder.com/d/files/52119224807.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161008773773be---56598064721.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tojula.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/89eb47d210c17b323e3c75877340b4e4/9138763816.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/3632369497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jornada+de+trabajo+en+peru+pdfPDF 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_off0001a8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D5 23828 bytes
SHA-256: 4bd8844ca0215b0bd2543310d3408ec611b013408d21b6b7dcde37d3f7d39b32
font_02_sfnt_off0001fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE08 10544 bytes
SHA-256: e5fbcf8b60721a1e894bb0bfd8b2a2fa64640d600c84c582fec53666a7caf34e

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