Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f51c308da0b0411…

MALICIOUS

PDF

89.2 KB Created: 2021-07-30 00:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ceb725125c81872c5c194d90b25d71b3 SHA-1: 2ce5d4e1e7edb99a4e6898e08e56cfdf8a7ed2c0 SHA-256: 7f51c308da0b041190566711ed8768f21b6b734d2a25d5e06dba46942ed14389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/820e05fe294f23335f606943f1ad0c5c/66326539002.pdf In PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/jameximagefa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3lq6vg3iri2r0o75ev6ghe1r1e/letabu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0e8r5ijmivfqrr5fhp5vcuiqls/xavozubagabodudifulonani.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mozidexemesosokaj.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5dc5eb4d9cfac9101a5cf7349bb1858f/gawulakotutujitarazed.pdfIn PDF document text
    • https://amblamy.ee/upload/file/kojabanufalumobasurafode.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/gimemumutubaradifadolus.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/bqffieochqdnp03sqg35dhbi96/kixulovinikutaweme.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6843a1f87ce6ddccc956c06ddfb57dd3/sanipakagafiwidemag.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed6748c873---nizuvirodifewuzemu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/49840906700.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l81ug691lhqb8co6t0lvu3ias3/sojolefuganexelitim.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/25704275247.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/31396719009.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/tujex.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/kigafumopolusut.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/78009973115.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ibtj0bo229lfgarstfsc7b77b8/sabuboregovoj.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c3aa849bd98adf637c60e75f18560a0d/9433476467.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/46312772452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+math+kangaroo+testPDF link annotation
    • 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 17756 bytes
SHA-256: 5a9500f51f3fafb8064855ca996e7a3737a128ff18f547c62c3e96b8733a0c80
font_01_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 10592 bytes
SHA-256: 444dec5c8a33daca8ab555cc15830e6b6a66aba68b5607da507b98e8e8bb5a7a
font_02_sfnt_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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