Malicious PDF — malware analysis report

Static analysis result for SHA-256 6548e53822dab079…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 08:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f554a590ba61255355c8f7c7511c26f1 SHA-1: 0e1f5db7345417c4648ddbecacdbbb531770b234 SHA-256: 6548e53822dab0795198ee7706b11f51a48bd9614c56369749cf133f928a9220
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5pan0liio4usr59s3es65uotjo/xilujejejodejuwixilanitab.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66e708443---daruwuzoxududidib.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1b7c44f1c8d0f4b805d42e2ff2f72418/kidova.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/32f93004b0cd916440727a45e61d9e45/totunexigofilot.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082219d5c30e---sirukos.pdf
    • https://akapacha.com/userfiles/file/lurivujukeji.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0e27f08f42492ffeca8e4afc89ffcbc7/libirelinafurudef.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/8u64i2ald9m9peg6gf4p6r6di9/xavokinokaxufowatoxuse.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/40a138b909cdefd4ef8acd6616dd99b3/jadomapamutodarunozadowaf.pdf
    • http://vom-ragnaroek.de/uploads/file/vidonuvazaxosamidotapa.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71e0b6556---96623308737.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ujvgk9qgf9dbsn7e88hqujsjko/90500939526.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cf01f7f3---nuzunuxisitiv.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lstm6202kv90ars3n7c1va27t4/55765029499.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/1d5c0528e18d8cba963c11721b9765ce/93814545920.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0hga65a9se8j0j55su2g8eq4ar/45476082173.pdf
    • http://rauvuonsach.com/images/uploads/files/fekuzolarukuw.pdf
    • https://kuepancong.com/contents//files/48536535218.pdf
    • http://gpszone.hu/upload/userfiles/file/tedekam.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ksjdfgf5nh7pqc37s8eh58r1ea/jurixegunu.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/362vvr87h0r5mjvioaa2loselp/tubaninazakuvubebu.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/wajudino.pdf
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/69542822707.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e60fd1cc76---98532561525.pdf
    • http://x04ydivan.ru/userfiles/file/keravike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+pronounce+spinach
    • 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_off0000f886.bin
1465f23e1a26e7ea75f29cc591d7683ac34788d1cadbc5e7375af4a5f2797396
pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10604 bytes
font_01_sfnt_off000110c0.bin
55e5eb0dc05502ff3f12cb6e6d08d516822482837701c34f79728753e9fee573
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 18500 bytes
font_02_sfnt_off000141d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D3 16792 bytes