Malicious PDF — malware analysis report

Static analysis result for SHA-256 721a64f14a000e4b…

MALICIOUS

PDF

82.9 KB Created: 2021-07-03 10:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 020e23763d247987a8e3613ec56b3ef2 SHA-1: 9a0f301a6d6d12289544d701029adda218952070 SHA-256: 721a64f14a000e4b2180069de8caf24c14d1046eea961708c074d36a83f95fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://chiaranannini.com/userfiles/files/sumusofurusibagutagojak.pdf
    • http://allycatering.com/userfiles/biluvi.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160717195b0da1---24109748001.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cfb26b3d7---xixugojovenove.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092baa4ecbaa---tobozabufobaditav.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/15349662974.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757069b0ddb---xebelurevuw.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eecd32f8e4---gudakozosifoforuvogoxi.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4508fc3349c3d36d17c3814ca92a6412/26939416950.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db17db94---3158376792.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/08fb97ab1e4d4d6b8f16cb18cef37921/6679426121.pdf
    • https://datawire.gr/files/files/91200976627.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e68e4eaf---vitubutusoti.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddbd84a6c---16154341816.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/61e598ff84254b65b97a1817205117b9/jefunekezirufopakewe.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739b4375cdd---19400414476.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608accbe4187b---44353817018.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/33ad301e74922abd6838c31d223b83d2/14618457078.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zilomowunuxidawaxamov.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ded1792b51dd6f0cb4c711345f71ee65/27832679337.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83667f047---89386884135.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082563a9f7e7---sesesubogeji.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3b2i4qh8tqu7hsvvmns0b54ij1/jizegekakugukenowotu.pdf
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/fadafuvukemonaxupijebobe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+johnny+english+strikes+again+online+free
    • 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_off0000e0d9.bin
0d92e92473054bd3551c99ad6c46bcb0a68bf0014e6c2c6bbb446d6da99c5149
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16832 bytes
font_01_sfnt_off00010ca2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 16792 bytes
font_02_sfnt_off000124b9.bin
1f88f2ff42b2d0eff5ef96448a14a70158bb91f354495a41e5e76c6e238c4584
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 10944 bytes