Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f19375292a6d1a…

MALICIOUS

PDF

112.1 KB Created: 2021-07-04 16:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 10dee02dbc09adc7c2faccc2452382d3 SHA-1: 4bbf8d6dd85780b0a6490aba6b416e5ef62b52e8 SHA-256: d0f19375292a6d1a6ecc1b039538467eeefacca972db441e9336bef273f0c766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://pistant.ru/uplcv?utm_term=at+most+inequality PDF link annotation
    • http://gocreate.termall.pl/upload/fck/file/kudejiloz.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rijebodopuxudem.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/kusoxazulavumoriwagikom.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/62246705694.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/65391164798.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609212f1ef938---wawudurudas.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972ff89a6b1---japawise.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3660c89a---wukuvojokifewiguk.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be062269ee3---vadunisariseduwolazolofob.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/gupidovifini.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rfprp53p8r4d5df0p2lieops06/jalena.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f9e97a810037f5fba08132407847507d/tejedavo.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/puzigasexonogevobu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/90052184001.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/begosazened.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/56101aa11cacc7b2e01cfe1ae50abb27/91973927306.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1eeaf9db68f2ce1b7196b349606e0dc9/85457216728.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08b81d686---gokogiterofowupar.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00d677b7f---dalaleje.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/88445097694.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/29885116.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/4105887442.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0646734e51d1124d3bb46873e5b747f2/49097867652.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d2e7afbf---zowejinexozabubunovawu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/gamojilozuvuxemufigeda.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3f4628ea98f6ab489738f684f0d67ac/lobakuzowovawo.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_off000153e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E2 17548 bytes
SHA-256: 399c055e01acb8549af6cbce81878ac859a396ccf2e571ee2b44f500c3f4a945
font_01_sfnt_off00018192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000199a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199A9 10508 bytes
SHA-256: 56768ad2bdda9538263661add7ac055418778b24ed572f45c828929f44202743