Malicious PDF — malware analysis report

Static analysis result for SHA-256 9368b1c0f8ce8634…

MALICIOUS

PDF

78.6 KB Created: 2021-06-27 22:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd4ca1145125abd4979c4d3ddb3a842a SHA-1: ed4030d66eccaec9b1302ff2c4a9f8d042f1c5f4 SHA-256: 9368b1c0f8ce8634b96cfd3e4372a2e3e7017e24d4d06015945af6ee39b6d970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a3bf0b01b---bilupefavapaxiwaxon.pdf
    • https://autoteam.in/ckfinder/userfiles/files/13432923346.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/28693211663.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a3d40240d089f44be9616394642e86c4/11684470919.pdf
    • http://wildpflanzen-planung.de/file/73207092763.pdf
    • http://monkey-do.net/userfiles/file/23131703414.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/71355008674.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5eed578ee---78872650427.pdf
    • http://i-daa-wl.de/userfiles/22254115288.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757939d7d65---35628530907.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c2c0c8f31---11258272517.pdf
    • https://prtl.pl/userfiles/file/47022344230.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607308e285aa2---41195735971.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7d89827853feaa9e78816538b83149a0/zipogetibuzav.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e98db79f8---63078981163.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871432f0059---fugifalukimamasaxonipo.pdf
    • https://jotekonybakterium.hu/userfiles/files/64436229538.pdf
    • https://banderlogclub.ru/Files/file/bebevuvudepetipisoxin.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc6970363---dolodibuzarejapip.pdf
    • https://alate.org/admin/fckeditor/editorfile/74401245771.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b01f44tda2qacmacb7kv6183d4/lovopawa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nobody%27s+gonna+love+you+more+than+i+do
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/befea49834635809624d18f5a96829b6/ripokutasutiwe.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_off0000cc95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 16792 bytes
font_01_sfnt_off0000e4a7.bin
af0f4f93c9ca282e6fc26824916a4a865471c85c5ec5f981f46f1a1f8dad9b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 19076 bytes
font_02_sfnt_off00011395.bin
4ed18d33b11278cb6ac8f0bbc4ae40018e009fd142b774941a3b837d0cdc1157
pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 11124 bytes