Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76bef68b37436b9…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 04:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca5d7b91976c48d7843b84acd0cc974f SHA-1: 3c64987548bc641611b17d8cb2c1562e764fdd96 SHA-256: c76bef68b37436b92e524ca7124ea163132b441c1f8e7b48691af658fc6de0a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b04290ce2ab---48816545848.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49b3c5c89---dikitegofoxov.pdf
    • http://kelvista.lt/images/files/neboguvisukigijogut.pdf
    • https://bestcoloringpages.com/userfiles/file/87094365218.pdf
    • https://101doctor.com/uploads/ckfiles/files/60b4d26999d85.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87197e5c2---29229098819.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d5a7607c---34889764815.pdf
    • https://anthonygillant.com/userfiles/file/8456745664.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae0d38f4ad---29776858865.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/334614497eb59a5a491ff7d51ce3d9cf/dilagimewubuwiremeto.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c8b47af0---petopazipizibadatixisuno.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e97ac0a600b9f2b51ceb8ec33d03fe6/85152678187.pdf
    • http://cuatudongbinhduong.net/uploads/files/61403999499.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7db293194---27145736868.pdf
    • http://coopmong.com/ckupload/files/68732224180.pdf
    • http://ufnk.fr/app/webroot/files/file/65247988388.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/knjgqhr0q3g3b7qcj4dtjhumo3/nadujijoxawozajuwiweleb.pdf
    • https://palcev.ru/userfiles/file/burijema.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67b5aadd8b---95650282036.pdf
    • http://www.klimavill.com//data/editorfile/60524332674.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061120490880554.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a263cb0ed6---66795501217.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb8a024488---jezejadanekow.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53739c4a9---61427517592.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fgopvph7ok9uie8kcumm8r6s1n/jotet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=self+initiation+for+the+solitary+witch+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_off0000e9e1.bin
f7d72e7a609778ab4971f85aacabca42493549c591252604b7985d0e50ac0a56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10992 bytes
font_01_sfnt_off0001036c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
font_02_sfnt_off00011b7e.bin
a378028b21a8f20dc8c5df012d00244f0ada3a0ab79f3f1a8a9e570dcf90eda0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 17568 bytes