Malicious PDF — malware analysis report

Static analysis result for SHA-256 535a8c6f566d4bf5…

MALICIOUS

PDF

68.1 KB Created: 2021-04-28 16:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a2e5fc4c8f4858eccfe859384581308 SHA-1: 35b7a5c145384f264cbb9a8a6622e440747b94b8 SHA-256: 535a8c6f566d4bf5e995a3dbfd8ad09a90893a9f331ae30090923d980463b9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content. The PDF structure and embedded links are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/993e06eab8365a0617c68dc1ae0afb20/85879028884.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160824b04af49b---wakozepudu.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pm2suji7lchs08n2asoaf6qqd1/wufakutu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca8b5742a---sopowisubajukanalewulobak.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92ff55e712d377ea11520bdca6efcee7/zegupijugigevowaz.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2a1989199aef2ec74ca46c6d41cc0d86/mekisokaliladumotedok.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094d198a4f---pizuvezosobeweruwin.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l8am5iguvp3kf9bu9g70lu52f2/35791349762.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/0403c48c16de600a44284b79c999c760/zofezigarolive.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608232bcafbbb---5850500102.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85bd5d364---robezoro.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/26k16d562a7mn0o94ek1rkttt0/50434024985.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082863aeb98e---31729220326.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a374ef95---5394676392.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8c0a422f3edc05af1bc1483219f1a7c2/57534785529.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cable+one+tv+guide+idaho+falls+id
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a5.bin
b83977986b13052c1edbd4e333c28d71993242ea68711f5f82ae572977291da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 5180 bytes
font_01_sfnt_off0000e647.bin
938f70fa17d94492741dcab490e49be06f34e4819bab1d1425e941cb48efbd38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 10536 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.