Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e340b994b6a7273…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 10:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5e0e50395ef287340d3f9c231e30d11 SHA-1: 3b0129434445f9f196b53ec21d794fc0e0bfc3ad SHA-256: 5e340b994b6a72737e2d6772f2566fc6f224a8d23aa042267d15d10693f4b552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a link farm designed to obscure the final destination.

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://allytemp.ru/uplcv?utm_term=thick+film+technology+pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf78bb2af3---vuminatakiti.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ccv73diu3614h0k5ubke8js5qf/vorufosenulazaladederiga.pdf
    • https://scavilecis.it/userfiles/file/51633542049.pdf
    • http://mywymc.com/userfiles/file/71164062948.pdf
    • https://accuratesearch.com/userfiles/file/87176536797.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/32af3030ef7cd6b9c3223ba507a0e714/fised.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fd93d7d0e182cc76ff69a604b616973f/61744501282.pdf
    • http://toonesk.com/upload/juman.pdf
    • http://wowbond.com/upload/Fckeditor/file/sikafopuwinedijotegunisun.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/96200903618.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b243e37b---sulaxitatipuranamoda.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/mipifidokap.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/666jb5k3jn9incelamm8ooagfb/11492467296.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/nunewuxi.pdf
    • https://dhesient.com/media/72710982079.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8c6a54a2f0332748bc3e491f5ca45058/duzonunawiki.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/507fe3097c97d9cca366b72f5d5c1eee/nibefewajujaso.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3fb5bba5---nisinego.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89ff3b31b---48241631549.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5qmtgnp4a8bdq74mv0r20dij68/74751676643.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160824962b2599---97374959185.pdf
    • http://b-solutions.net/userfiles/file/pavisewut.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d22b2ae4618---tovigapipidulijovejifu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/v5djth58efjem7k7hrl39d9vol/34150068060.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1fdb4a7d---zewiteveganedanusagoz.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_off0000f7ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16792 bytes
font_01_sfnt_off00010fff.bin
dcb2e92a745129e1bcee3c8a6e0b0cc0111928ba3fe2f6e5a3bd5ba865f65fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 16808 bytes
font_02_sfnt_off00013c04.bin
40721691689d2875269f22b9be9007c88d295335fb33ff5e77c14e82f1c3ef8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C04 10808 bytes