Malicious PDF — malware analysis report

Static analysis result for SHA-256 991d7eb99a052980…

MALICIOUS

PDF

82.1 KB Created: 2021-06-10 18:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3404556ffa2dff8ff655d7942f223e25 SHA-1: 78b9d79950647819e1da58b83a0a25e175d5d297 SHA-256: 991d7eb99a0529808ee10a50c0605336c4b7f35c04e25b40d700b4b3491821e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates a likely attempt to lure victims through deceptive links, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=best+free+apex+legends+aimbot PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082895f81823---92402089123.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/25e6574ddb2af3c5d55fd72242be19f9/42952043862.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pcbt8ke9oaj9kdo9b30otqpf70/72097875208.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7fa4e0d730e8801c7bdf0ff02f157457/35095456653.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/wivefogi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acebb4cc7c7---81872389923.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092c81f9773e---34685653269.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a915cee37f4---78658157127.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/49904335140.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00a70cffd---49916822653.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/47cbdfd3ed36427503dc2c38f71cc1e5/xazuzoraxusufuxevukig.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d4031da28ad4ee488a808853c14a38dc/jobuwawuvujewaw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b59fc74e5ed0cff3f9a5c4121dfa3f23/36258269003.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/26ee2cd127ba64236637cdb4010a995d/73234700196.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g23u5vtobuo62kmf2ehgp7ldb5/vadujuzawuruti.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/mufekaluselarevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 5616 bytes
SHA-256: c695bb069521b0a5e74a75d0229a1e0f883c50abaff815e6980759bb47260d5a
font_02_sfnt_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 10860 bytes
SHA-256: d11566008eefdc382ed7e16e1dfacea3784dcac19ac2887466d5d1d5d19d0db1

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