Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ddfc6b276a9a68…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 12:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cede14f1d0f539f3ff959a713dd2da4 SHA-1: 19b8ecadd965ae1bfe2389ba211714c413d64d46 SHA-256: a9ddfc6b276a9a68049754ee1d83592c76b0b12a2cf615fd88fe1d7f3d2e49ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting a link farm used for distributing malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to external, untrusted sites, likely as part of a phishing or malware delivery scheme.

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849394ebf6d---dituregeguxufelonugixeke.pdf
    • http://onishi-kyosendo.jp/archive/bepemojelibe.pdf
    • http://jhferry.com/data/fckeditor/file///tinebafi.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/57c5c411ff3dcc2518cb8107cfebec12/23094264399.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/51b56e1872da9db8efbc8c58921e2f88/bapevunato.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4ae8243dcfad879b0d220b1adb9c4cb2/kudobusabikugizagawizapi.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870eafec6ac---basofifabomedobega.pdf
    • http://botosani.ro/img/uploads/file/77127373144.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60548271015.pdf
    • http://aucoindeshalles.fr/menu/file/29285241466.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f845181b88---89729355668.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/da4f66a8efe07e42933517810a045b1e/vuvuwaxarurudixozuzaruk.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/87307687860.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6db2d447---sexisat.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab0e3e01d---45687827422.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e61395702---11790809970.pdf
    • https://atraba-holding.com/userfiles/file/4226164326.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d78ae022a68a7bb0ea4e5f37a4b5447b/bewevilekedenipusikawa.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b21bd36c---pexuzifujetod.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b43ddf794---nakobiwuf.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076951c8910c---gifeluxigopipiw.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cadc5082c43---73263459913.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5o08k69lht3op2pj8hs0opm23e/didirogopopimakitus.pdf
    • http://caphegiabao.com/upload/fck/file/kekeladapinogaxaputapud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+arrival+picture+book+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_off0000ffe3.bin
a15146da2f49cc7e1cfbabe2d9c67a6eaf34fdc622d24aeb2c21d067396a3f00
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 17364 bytes
font_01_sfnt_off00012d28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
font_02_sfnt_off0001453f.bin
2c1d466ef06bc1193f5985c39103d80a2e2479b397c47052ad6e49c307d71135
pdf-font-stream PDF embedded font (sfnt) at offset 0x1453F 10804 bytes