Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b52f11b916f39…

MALICIOUS

PDF

81.1 KB Created: 2021-10-09 11:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1f02f955605f965e513aa92281a3d1eb SHA-1: e2fa63925ea6c4b75a502605f17f4d597ab2812f SHA-256: 651b52f11b916f39922e585f4126d6d6c488431f1f281db027782560e4922380
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using such documents for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=my+life+closed+twice+before+its+close+analysis PDF link annotation
    • https://wilocom.ro/ckfinder/userfiles/files/80824089967.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jm4v6k2oe9ectsa7fcq9i87v0/89202022633.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/keraludubug.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/gugivenavetutupoligip.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/95278654430.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/feperoforijezukipot.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/93868177459.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/dakomurimulexibumono.pdfIn PDF document text
    • https://ibericadearmerias.com/file/minoxosabavudozoni.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d42ace94b9---43144741337.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/800deb.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/83015980673.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/35817374227.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/93c9f8427f3d15d09882191e645803c1/gejigasudejafobaviponoj.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vuvatozilij.pdfIn PDF document text
    • http://boldogelet.hu/media/369600783.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/73234273911.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/90323746231.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/9529057007.pdfIn PDF document text
    • http://montesantangelo.it/files/files/modajepad.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/79232130828.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/lebejelisifilir.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/fudijifuxe.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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 18032 bytes
SHA-256: 12b12302ce31463285ea65ca32abbb05eb6b6cbaf71019ec93dfeab32371b274
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10804 bytes
SHA-256: ba9ae9fa8f0f793b7b61fba7616c7285cd8352d878fad15a93fc2ac92b565a01
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1