Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cad91382052710…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 23:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b50f3679b97e3dc3cac5f20a4115502 SHA-1: 22b133af7382582d426e864b420490c89c566e60 SHA-256: c7cad913820527105eb76bbb63cf7995da7067a7e9f315cb997dca1783d54c6a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://irlanc.ru/uplcv?utm_term=tables+till+1+to+100
    • http://jnnycc.org/userfiles/file/rololesopaxuro.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823cb79e8b3---76372686869.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/de39d4c41c493df899ca76b1e2df4b08/54807813533.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728092086ec---jazimubugavutu.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/dfbjs2i29snubol5vcshn0bl66/basezaduxiwadu.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8747d4fc31---75950251176.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0038dc9dac---degakazilopilojet.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf8e2a3d---fulelirusujukezomo.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/8bcb402c5b1712b26958b9429b13a179/navijowazolor.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160855a0faab8f---radow.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c06c7102---34125076087.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/371c017306f5d23df59090b8c0c51935/59606570424.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160706fa053467---getujilififiwofinosos.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071cded98c52---76952141124.pdf
    • http://slsnn.ru/content/file/28555848758.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bd9ab404---dibadusirepe.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2558b1b8---lanafavatugasopadajir.pdf
    • http://pttaccounting.com/userfiles/files/livazolib.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852c00b465---xunanofidujerob.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c0ab59a5---19561831594.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/69399794287.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bea55ec2a---19230988811.pdf
    • http://kgmda.com/upload/files/33477360211.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ba7810e794dfd06a1ad540339519aa09/18001269567.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_off0000f03d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16792 bytes
font_01_sfnt_off00010854.bin
cf46877afb613a28c6b63e38c36205fd25e3a94aeedcb68dce8d9d1043df11de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 10172 bytes
font_02_sfnt_off00011f48.bin
eeb90f1e09fc1f86e13d08cccb26d85bfee7256040d1fc4088e4e5e2b3fd8acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 17524 bytes

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