Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f923aec15a50ae…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 19:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 296c6c6cbc1a6f492586e6d45cd6d29b SHA-1: 676ddf30356fa187436bd57fc806294fdeb0f1a1 SHA-256: 04f923aec15a50aefdceddc7ad2da2ad5d32147eaa6ff47e095e0b72c67f2ef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous URLs associated with compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://flying-vikings.net/UserFiles/file/86869910870.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/60b919318d6ee497cc885cb905a4e853/notexud.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/26979433182.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/suvbugab6qn72d8h6gb3pllum5/sirofarogonuzopuzisazuwid.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c301f0c68e1---basimusalukedonabobeja.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6818cb9dc0126fd7e74073a4d61a8eb2/40019961547.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0f11e6a2---tagofisugeferugululona.pdfIn PDF document text
    • https://majubesar.com/contents//files/xofudoladojebuwa.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6d77d45749aacb669c6ea6851e989128/jorebil.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958f6ea6802---ruwemagop.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054b350f36---pojudojatuposufevo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/90794016488.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095642e1cd0e---xumiseletodada.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed569175423---kovirojixemaf.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/754311mk5lcnibud50147508s7/kiniriwazigurezox.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/6907297209.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fezukopi.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/90935908348.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vesuvivibe.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///18328840448.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b90b884096---39505983903.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/xonurewodobat.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094741a80265---xumozugipanugi.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/6ecce8bbff2d1a3f99cffe25d8d543b6/95972047695.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10e5379af9---64810745430.pdfIn PDF document text
    • http://chinalabware.es/d/files/53644707338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reduce+pdf+file+size+software+free+download+for+windowsPDF 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_off0000b5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B9 14780 bytes
SHA-256: 30c03658d45b9323a2f0cceabb65a58fe8ed55b0afa5b28529d597ae7566c718
font_01_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 10904 bytes
SHA-256: 85b959eb37c1bacc2b1e065549cb8f5a0c2812cf2cba7812d1c58b1ce0c999c7
font_02_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1