Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24fc34ff114e98b…

MALICIOUS

PDF

105.8 KB Created: 2021-08-09 06:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6edd1d463555a84ec3735d10d90c0a0 SHA-1: 2b633a50415b4cd5dada6cbde301a85eabbd5c44 SHA-256: e24fc34ff114e98b64a94b930ac79293fbfbc5fb8ec42c01e22f39fe840694be
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9031febb---nomojaberinavipolavebegi.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1535d1f4---59189395821.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd725561ae---kawisirexerepelulapa.pdf
    • http://aire-limpio.com/img/editor/file/datep.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/livelesivuvo.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a3a32b68---kamixemoroxurerapexo.pdf
    • https://a2designbg.com/userfiles/file/82712890987.pdf
    • https://nikosdimos.gr/userfiles/file/dajifixemurujelili.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7a1a6f6373c0ac982b0543449f694dd8/rawisore.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s65ccpgv1iua7qac99gf9e76dt/27685756872.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbb3e68d29---menajipazepibojuvuxif.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be211ea285---zosolazetukago.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cc079742a---30962967300.pdf
    • http://archimax.ch/dynamic-images/cms/file/zitepiderudo.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608067c6f3ced---dadakizamolo.pdf
    • http://filtrydokoparek.pl/img/all/ditaladegisejoguzimekuxip.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/sinotusevipim.pdf
    • https://topclassgreenery.nl/images/file/luvudo.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/vesefemugesanubaxudox.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/21578066599.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/uvkllf7lupl8h8plbafga6p1n2/posipinuzibonirojejekav.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160722b51af95c---kedera.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/nn1p5atii4n4v4k818dqe95nri/1657995368.pdf
    • https://wfca-czech.cz/temp/userfiles/files/72270891600.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/17817094657.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vumiwixenugunabiruvikula.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+host+discord+bot
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 16792 bytes
font_01_sfnt_off00014638.bin
ed7e3c54c151c461b2582eb880da1e0fe29c78268b25eeb4484b9d53d3604aae
pdf-font-stream PDF embedded font (sfnt) at offset 0x14638 10240 bytes
font_02_sfnt_off00015d53.bin
23cd7f3f7a8e8d1f16c3474a32eed34f65114120a337dd184d52dfa1e97f1dff
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D53 1892 bytes
font_03_sfnt_off0001663a.bin
27b63d594679290d0d10c026c7edab1ebc6e989adb95cdce9ed1f395e9dd5c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1663A 19116 bytes