Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c606bc7ca68d219…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 09:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4691ecf3c1f541f7b2020d54778ad4b5 SHA-1: 4ca2e4fce7f6b21697ccd0186eb3640d4b6e4b92 SHA-256: 9c606bc7ca68d219deb00a003a9c137c41b7f9a93a9f3c07566141e74e4c88e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to deceive users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=make+adverbs+from+adjectives+to+complete+the+sentences
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dae4599621ba713c297aa52b34958bc8/53694691466.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ec0d8f6d692135f5d06795aebfd37584/sebokepepejo.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480e7ca90f---divabunit.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b280c50ad---90594484362.pdf
    • https://atl-50.com/files/file/84910819006.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1fbc940e---lutemo.pdf
    • http://shinies.ru/img/lib/file/gomibelogogerezitigulesa.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/555873db6e559028dd84090a5353cb6e/51273858592.pdf
    • https://digitaldaya.com/imagenes/file/wezoxexugebovidop.pdf
    • https://dadesigning.com/daduserfiles/files/tujer.pdf
    • https://coil.hk/upload/files/wekew.pdf
    • http://faxik.ru/ckfinder/userfiles/files/tavumogotiranijobusuxe.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/pacvdqd5hvfta7qjk0e17g227o/retixamavi.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3f10f09d89110a0d645fdf3eb436b63b/serenobadovolemawikiwanan.pdf
    • https://xehowo24h.com/images/ckeditor/files/54183767307.pdf
    • https://wonkingchina.com/d/files/27023778375.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d177c4502---zidulifedatad.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086b043b50ca---24778873597.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb3c99b6b---gojiboxuradogobujojanob.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38ebc0d26---nesaxezo.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416148f975---34269933443.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8533eed2e---bikokinow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1b.bin
59734eeb0727805d9dec4814ce36fe2fa32361d7c542e3bf7660a5f76a5e423d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 18488 bytes
font_01_sfnt_off00011a5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 16792 bytes
font_02_sfnt_off00013271.bin
b8dded06c161bf4a21e5519577eb6b3dcc426ffe6a10d302ed375d6d156af82f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 11308 bytes