Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0bd0f02464a812…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b933fd7d990fe1bf03d1ca38efd17c4b SHA-1: 1dbefe7a59332a25421868fc0266da0e25919efc SHA-256: 8f0bd0f02464a81233bafcc4ecb87e742a7b7c60ae1722b48bd81f6c1bd9bd4b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=jumanji+welcome+to+the+jungle+watch+full+movie PDF link annotation
    • http://dlastudenta.org/Upload/file/93495479657.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906032714.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/vanoji.pdfIn PDF document text
    • http://lagrupacio.cat/file/modenugisekozo.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xukofepenibitokixufoboral.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161377381031bf---zizalopixepifepan.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/72984792386.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/waperikeriresovefakuf.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-22/75469abb95b35272f29ec70f9ad134f6.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kodukazilomenano.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/masuxudak.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161482f5076b27---pobewawulegefewut.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/vamimajutofopesedul.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/winagenuli.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/matakamajobiwovuma.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/5969581008.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/xeladezulezavezitutetum.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ee3df2a9702eb316924524a58ded068e/86532748528.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xoxupasadixalowuroxifuxa.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/86867764529.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o0bousu7kijr2ii71d37eogsl6/64089529439.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/pisebinopugu.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090218490173499.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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 10888 bytes
SHA-256: d6e678616d8561dc15ec03100da9f18d2d5841791730f365378c835a33764577
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 15252 bytes
SHA-256: a6cdad73ec33423d0d4ddcbb866998bd9633e97a034233f590aa4a795c680a51
font_02_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1