Malicious PDF — malware analysis report

Static analysis result for SHA-256 817c2fa830378c19…

MALICIOUS

PDF

97.1 KB Created: 2021-07-20 05:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97e365bcfc35904ae3458e1e16c0a2e2 SHA-1: 2d841dfed4bed9669cd9fa77616a6ee5eef70a37 SHA-256: 817c2fa830378c19aa995a8fb243e2b4520f33648992ab08a1352dbe230cee58
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://ellenia3.eu/userfiles/files/72050681630.pdf In PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bedepixakugepunitubupigo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609470e84190b---92514955695.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac872b4e6b2---powititoludu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5626_20210525125743.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/kifolevep.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/37b96e82d0aeb6f03e3f55fbe36da433/80424917671.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9e2ef743a903bcbfe67b5eb04a59aa12/94680809896.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/87821446.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/98702268089.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/22723464176.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c100df6ceb6---kabopogujezimizelekuke.pdfIn PDF document text
    • https://kede.org/userfiles/file/xetuvatotinitawugonina.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/95077637550.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077497e1a74a---68253189128.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/xaminilobasufufi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9352ba4087---89169912864.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/fujebisijafoza.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/i25holfm9l48dsf1ugopl9p4bk/58533197920.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/muxedezisojezonakuse.pdfIn PDF document text
    • https://x-software.cz/data/file/62323582653.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf17c8b6a4---tadotulerujajen.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8d6c52d9f---37687229452.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b36db5649c6ac2d5f6251cdb037c88bc/32080674146.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87494156475.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/rewemujogitowelisil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=current+space+travelPDF 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_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 17472 bytes
SHA-256: 549ec4c0a8f9a6ecb6f0cab388317c01352c98a5a2148db84bb52fc53c7b432d
font_01_sfnt_off00014779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F90 10352 bytes
SHA-256: a9a5518fff6f62a7ed2a91b10e5eeefeb1aecfb66c182da1a2fb0fed38171fac