Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2145fab8d3f5bc8…

MALICIOUS

PDF

92.4 KB Created: 2021-09-07 06:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f9a312172325000de2ce811645c610d SHA-1: e8bf729f0c8c55022de29b0758c6d81408208e7b SHA-256: e2145fab8d3f5bc82f838faa555f90c7e385b5ffddc8b5cfa6cf29219c79cbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=mil+std+810g+pdf+%ED%95%9C%EA%B8%80 PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9ik21s01e3vrs6qs6stdpg0spj/19981530608.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cb72a2d3---77566997746.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078619217470---tazikavemapekufusevunubex.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/tonesupolof.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/70989040808.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/sojixiwokake.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/98262903129.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/92225505977.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/77429428605.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/98421012965.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cdfaa9fb5b56cc101cb387f048282df6/jezasujefowi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4cc3d155ef21c2e25966f5b8d24db971/rerizin.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7vuln0a954ue5mffq1hp7sm87c/jibagatofixukenoduwotin.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c609044c7a4---20415249347.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3b4303120---dasavupuwupewapozatugub.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/guzexapiloxabugi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/dusexixewunoparevif.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d3983db---kalaraweleviragamodirif.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/79792662851.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/1783423612.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/dekuguvebusaxo.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/80644034343.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf64002ae---40882571152.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/89333179942.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30f8b3a9e---ladisus.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_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 10432 bytes
SHA-256: a87b9d107deb0bcf4d3039493f534a942e66962f94b5472e04177e40c5866fb4
font_01_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 20292 bytes
SHA-256: cf94d5c4c5275f1cd461910c7e3d18f4adcf8499021df82b7ab434a23456e4d5

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