Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1eabcaa1ca1be4…

MALICIOUS

PDF

78.3 KB Created: 2021-06-27 10:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82977c203a32d5b224d9d074d1f9eb3b SHA-1: 4f476052c7e2ea59241279e2a4715890faf71345 SHA-256: cb1eabcaa1ca1be4fb0639e17578defa16ede32c015561570f542f9e9ff9c520
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it could leverage embedded JavaScript or exploit PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b6132929e189dd4182a38adc4ea5f073/21893548662.pdf
    • https://ikima.fr/uploads/file/47084319077.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90dcddc35---lazemibegofimebinane.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160738bcc31537---litumebupoga.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/eddb38db8a603217e12929a57f6e4e4f/54126139998.pdf
    • http://alumcity.ru/userfiles/file/gogab.pdf
    • http://stroisvias.ru/userfiles/file/43968014724.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607611f4676c9---dilexebetomufo.pdf
    • https://le27.fr/docs/file/63272298034.pdf
    • https://hyundainhapkhau.vn/upload/files/wurozanetil.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b7f2f7fee7203a1914b353aec3582d6a/kesigoxekudopedagema.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wokuxilemapupefejegova.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093c7f3deac7---milisudimujazebazipu.pdf
    • http://ifa-astrologie.de/userfiles/file/69112129700.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160788d5a2433f---nonobonawasobot.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607426181da88---73656708718.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937f8bd8283---votoririwakuwuv.pdf
    • http://gilendor.cz/userfiles/file/81925465975.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607790d1a8148---58578128087.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/25100079017.pdf
    • http://exmar.it/foto_fck/file/10527370675.pdf
    • https://nanosoft.mn/images/content/File/vivizofuza.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d19f3746581523f3b334d5d04467f3d3/1838908120.pdf
    • https://hgindustrial.eu/userfiles/files/katunoxalanebuxuz.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b1c33fad3a36e200882b3a707c906cdb/95325822361.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/48pkihlkashvnsbsfrkb6rtnvt/wurobiretiniluwaxojex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gorillaz+reject+false+icons+streaming
    • 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_off0000cdb6.bin
d97962158e98e18e564b041d848c86cab0d392c2a4af805ee995d7013a776e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 17132 bytes
font_01_sfnt_off0000f9f4.bin
40de0b1497cf2ddf3f196469d5c26ebb718bdbdf0b5d6374e6f6919bf27f2495
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10908 bytes
font_02_sfnt_off0001133a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 16792 bytes