Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a154a5149298f78…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 04:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 911021baad411f98275b4736ce622856 SHA-1: 7c5dae23c2851bf7a14d2fead53546a7966d829d SHA-256: 9a154a5149298f78a06ce5431e9d8abe046a7fa4a7c4a0de095d336d40daa382
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=signs+of+being+anemic+symptoms
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2797add5a---danapeposukokekubuz.pdf
    • http://lukinserv.hu/file/23893266086.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/03e44ff078e62edef3a95b0a96cfdf18/narulowara.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v80p9su920lo4lnakjltkaf5dl/vexutujes.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bl9rh4vqlc4f5s94798jbc5st4/67372869507.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7cda547333fdf27b82791628346a4a45/tapojufijurobu.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b9caab37580cb4c65ef390df527adee9/pejivotaxuboxareko.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/vagogarixepusowenonotubed.pdf
    • http://thessalonikiflights.com/files/files/91884311023.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c44cc5c3---943597278.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c91570220a54e5fb2b87c18f6fcd6352/97653590691.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c8d5981cc64cb3ee1853e06699b3cdef/kekamogukagejisajarogowik.pdf
    • https://egyiksem.hu/uploads/file/xikazofusesabejin.pdf
    • http://hyperasp.net/userfiles/file/82135497426.pdf
    • http://www.heksan.com.pl/file/29759059018.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01fab731d---zaxepururo.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95230add1d---powuxazalati.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8186acc7---72522116797.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57f6e10d7---21721863345.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/119c4bb73eb00bc4e64597783153744d/daxin.pdf
    • http://novichiha.ru/pic/file/68052254179.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/121dce107ebff400d90bda81baab5e3d/71142242068.pdf
    • http://vinabomi.com/uploads/userfiles/file/84933629468.pdf
    • http://sobsai.com/ckfinder/userfiles/files/zenox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bd.bin
bce1c08b5cd62372a0661355c06a3cfba2436dc12ae4f90843a3326438547b91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16476 bytes
font_01_sfnt_off00011247.bin
60dc26fb5011fa6913078c20a4942ebe8ef56906265842690024f544a1bfc3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11004 bytes
font_02_sfnt_off00012baf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 16792 bytes