Malicious PDF — malware analysis report

Static analysis result for SHA-256 65eac3716c732b5f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 22:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3558d83efdf75649633d8c406842b7e SHA-1: 09705b9612f9384160f1ac271a975d64c1c49085 SHA-256: 65eac3716c732b5f29221fe4b30e09e50de2dd0573b51829c424bddd93ba7128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The presence of external URI heuristics and link farm detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=riga+crypto+si+lapona+enigel+versuri+pdf PDF link annotation
    • http://jirehenl.com/userfiles/file/250054104052.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/mepikakesilakakusiguvoxo.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/61683957371.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/50b0aaed5c7be644050bae4a6b92030b/41463278505.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/733fe7d7dbfa4f5f81285adb35cca88a/13444086502.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/58835244945.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/46286454359.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d320cd95---memulazexunotoxev.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6608c98b66480cd282bb53b60c74afa0/7743969049.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/tjcme66ri661mrdvp7taveiuap/35443012864.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/15d34308b40454b66d09fb6dbd21a530/zifupomudusewir.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b460ea68c---18880942444.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/65421714972.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/koxugajebudonujijakap.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/180838388950.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/polizofatodare.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/jixerewenopapujo.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/49646665117.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/63402868312.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85eab8e2b---sijowigamirerebup.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gizubigadanubez.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/93540691465.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_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 20028 bytes
SHA-256: 427ee3810796aac085c096eb4f6ae73553c4d1ca16981742d64c13c7396edacb
font_01_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 11120 bytes
SHA-256: 8202bacdb4dfcaaade52b107b1c20667f2dac165035fe144637dcd749e5e2237

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