Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff02ef1c4bc42c4d…

MALICIOUS

PDF

90.6 KB Created: 2021-09-10 19:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 636c1310d1d6f3fb102cddaddfcf9759 SHA-1: d6a12e182d85d656f6a7a2485774ab29bd55f1b9 SHA-256: ff02ef1c4bc42c4d1760d29d0382999f246b7cf96eeabd8c62ac5500967efdd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites or disposable domains, designed to appear as software download sources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm structure and heuristic firings suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=adobe+photoshop+crack+32+bit PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/winularipakigujedar.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/3682241748.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/dedezipugulo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c8c498d150ccb22671082a73f15ce44f/jalepinuferu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wepezudegiluxusukek.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/pepibofolakivexipofajux.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xenumumozufupi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/60264472597.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/mulituduvuwen.pdfIn PDF document text
    • https://faceless.me/userfiles/files/lomoguxelepepipovigiwe.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14533681986131f3b54e2ef.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130811547c6e---dizalelobum.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/wobozof.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wirawa.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/43004381063.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/86997380345.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/simotemivumerizexekinan.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/43835758326.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/suvopebowid.pdfIn PDF document text
    • http://elitvorota.ru/f/file/81260208717.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/novesogupasavelonepokimos.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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 10968 bytes
SHA-256: 6bf6584f76a5b2dfe9f84fe535fa09f90331d3e46f3e65a29e3f80150b998c43
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 18620 bytes
SHA-256: 0c4cb662a508ff6a6804510d8a17d1f2e87460334e4b559c2177b9bff5d07eb2