Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8cf53db9dd9003…

MALICIOUS

PDF

84.7 KB Created: 2021-07-21 20:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 891bcba385e375d02f5ac1807b9a340d SHA-1: 01ed0c83c82323465bc463f5c10f51d6d1534000 SHA-256: 0c8cf53db9dd9003a6ba424c939db965577d0210865ad4ee4a10504126e8c7e5
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 multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/20836fb6c89c834710f3649f7119fc08/266290189.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/26b2f8b65facc9994e7365bed8d4518f/sazokokomotewemabuliziwo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d587a1a2b---komakejidu.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/etpos1p0rb4j3tnae0233799a6/pelagat.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e52512e5dd---dezitaxixunafejakize.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kf82gt4hu5viqeno9rs10mnbdb/81105629479.pdf
    • http://targdenunti.ro/userfiles/file/96303068661.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73b0c0490---30966158204.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab041c4d00---13149782028.pdf
    • http://bidmitt.com/img/files/file/48609128389.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14e92aedf---85117692269.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69d4422fde---29292522503.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/82228949918.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1e2f9c71550a57101fe0d5eae602d0f7/dezagabutisi.pdf
    • https://lasanisports.com/files/86778256145.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082aea92f94f---wewezixiwejuzusuwo.pdf
    • https://network-italia.com/file/56429007892.pdf
    • http://18554080.com/userfiles/file/lidifevivivarufajovofeji.pdf
    • http://aceonlinementors.com/userfiles/file/naligekazibe.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7d86cfb5---mozusewiti.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89e2a246a---78930678665.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e94acede---gosotixokulelixovur.pdf
    • http://hoinhikhoavn.com/img/files/74838794580.pdf
    • https://alexandrapanayotou.com/web/images/static/file/jabolusotilidu.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/i1kub30th35f76pkt50mqn18j3/78163440393.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=carrier+zephyr+30s+service+manual
    • 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_off0000e6bc.bin
32f79c2ffdc9118450e94576a8007546113af7a22dd9cec0a4dec179275527ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 16612 bytes
font_01_sfnt_off00011203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 16792 bytes
font_02_sfnt_off00012a1a.bin
4d56c2b480b1726e71dbe688b42fd5a15161a16a7b6554f65913b114650ad42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 11088 bytes

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