Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f756b7fe70ef0e…

MALICIOUS

PDF

100.6 KB Created: 2021-07-05 00:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 467969178d53cbe65303fca6ae9841a9 SHA-1: 148815c9d2251c355eda8877df422aeef6fd9ba5 SHA-256: 95f756b7fe70ef0e028da1fa4b59e733a34335e6ebdae6d872b3de38e9ad2cf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's used to distribute or link to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://crysiq.ru/uplcv?utm_term=useful+english+expressions+for+speaking PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73e51ec8d---62688135355.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aad7f0912---rivusupexepijaxarikuz.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/puvopa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8bba7031881ad1df866f7e880fa50b2d/sikekepojowuxarokomam.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lebenusi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xawuguzi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0u8ffh1l8tc8ollu59qbi9r58o/nirifumudepivul.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/18772395161.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/39ne2end11urthmbop038m69j3/77430862616.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8dfecd00fab4e454bfd7babfe44a1cc1/kowudixeweredoremimupoliw.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/30503325023.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/64237510167.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab77433c---lupubebimakeguradev.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ad3a53925---ruxamoz.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0bb47d3f---29076347496.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/susezazedolalijuza.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee7f80a2d---18204717622.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec57075d54e8c9429f4bd888fb840fed/40743468869.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/vikozugilododok.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/4726045422.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/fubojodepevokurusaliwi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8e39b77d---73982966869.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kogijagokowenoso.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///98907157971.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sizafuvanaxewawijikofezes.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e4f66d2e---pimutovinimakuri.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 18168 bytes
SHA-256: 667981f304a49c019d658827479d4140db7469636b08159a4e3fd9d4ab3b50cc
font_01_sfnt_off00013b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B57 10840 bytes
SHA-256: 076221ea033bdfd65ae697d637ed957fd8856c0da9d58f13499ba757721624a3
font_02_sfnt_off00015448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15448 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00016a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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