Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b64c68f7fb60fd…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 21:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f83de30eb66b912bc817de7e8af44f0 SHA-1: a0f673773c148e0b7650fe07bda0f7361765e133 SHA-256: 63b64c68f7fb60fd4abe5804d510989aa4ed90f407cd673242cd58f363a6fcce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=what+is+the+difference+between+an+observational+study+and+experiment
    • http://jubileejec.com/userfiles/files/59990859268.pdf
    • https://sayurhijau.com/contents//files/futog.pdf
    • http://sammyuriasproperties.com/userfiles/files/69024024645.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/567721408a901d5d8ef4541118893471/sogatobijes.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/76hta28bve5228c6efagqeau83/45060887057.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a26362cd---renujizasotibudu.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/gipeg.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0b2rebcdu6ohlg1alqs9gorf0d/savasuximipudanonubep.pdf
    • http://premium-h.info/files/files/xenokofedavo.pdf
    • http://boldogelet.hu/media/pixirijabelez.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1c459e7a02fd3e55c15937dcaebba4de/natixofubegirekowuwojamam.pdf
    • http://georgekoldun.com/var/upload/file/jixolutiwuf.pdf
    • http://aep-tc.com/cache/fck_files/file/janeniwafegef.pdf
    • http://sport-way.ru/img/file/14169864966.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b75b170a95b---18770596792.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7269f8a6---11503715277.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d1458f7fd4b5cce29820640fbe078f38/28929194583.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aa61cf52042f4059c09616c6c6252ea/73947441432.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/parinixevotukapufupiwemu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58f1b9505---jazujebusetuv.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iia5rm7mor50km3d0u7vm3gbv5/gunojiv.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/50d86fe292de0cd0887a2fa694077496/21977464934.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/7927705837.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9u479l4vgit6fc1rh57sfhftoj/30680144261.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_off0000e7ad.bin
c6837ffa0f381bc1b2b6531e2e3c4dd4aa7417f7efae20755f78e2aea367f555
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 18848 bytes
font_01_sfnt_off0001171e.bin
fd237f799d1fd28b961dcdf73b4d2f280811526da6321323f5df079e99db55e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 11488 bytes
font_02_sfnt_off000131fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes