Malicious PDF — malware analysis report

Static analysis result for SHA-256 390c79c81f449d12…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 19:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4560454d0abb47c26db01662957a206f SHA-1: 9baf9157756ca2e5e892e49fed3550b25459fb22 SHA-256: 390c79c81f449d1214c8ec71cb41009b9d55934cb45ba0bfe4b2c516f338017b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=let+it+snow+movie+online PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e43a57a99240c722a59d545897afdc86/39262717677.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/wawuxezafoledamij.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kabumuviv.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/21055103764.pdfIn PDF document text
    • http://ranch.pl/files/file/96442249811.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/63120326062.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vizexorudukuw.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lojog.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efcea00c61---padazaxugotobuvuzix.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/wapise.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/31783124863.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/lozopem.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422ca299cd5---totuzitoz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614192e3bdb29---30973776467.pdfIn PDF document text
    • http://japhina.com/upload/file/63331827513.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/69144855850.pdfIn PDF document text
    • http://ijfbn.com/editor_up/lanulufe.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/fonato.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/rulevuzo.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/jewalemafimabexagusim.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/tuviloputewujuw.pdfIn PDF document text
    • http://moretonassets.net/userfiles/novixebiwes.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/nerugadonosoxo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136449255c72---nijosomunajaxofijolenojuf.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 10116 bytes
SHA-256: 452dc3bb06d926a433a1a271292534e848e39c15c579b336ae83fea139e16083
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 17644 bytes
SHA-256: a223c5fd0e3aaeda958dc20de29742b4a201753daca0833f9bf28ec893b01cc3

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