Malicious PDF — malware analysis report

Static analysis result for SHA-256 c919bff9a5ea2324…

MALICIOUS

PDF

134.4 KB Created: 2021-07-29 09:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0b46a8c63a4999f02e72d2bc9a9b7b0 SHA-1: b8abd810b84536ccd1718732df366e0c17d965f0 SHA-256: c919bff9a5ea23246bf1a582d4f87db5bbfc3133aa6da3de06f8807585e679d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://oniceh.ru/uplcv?utm_term=english+to+urdu+dictionary+in+pdf+free+download
    • https://superchills.com/userfiles/file/61320733659.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc4fcfeff---vuruvulatobuzeriki.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/22ef39741411681393b6e7e0ed200a24/muzerivewununalupug.pdf
    • http://midel.me/userfiles/file/winoxelujorulef.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/55aeaeafd387c23dcc49e1ef1b278c72/97927141797.pdf
    • http://splogservice.ru/content/file/15618535577.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7d7311a4---35937317836.pdf
    • http://pdww.ru/ckfinder/userfiles/files/kukovale.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c44475e6448---xemedizimutetakef.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9c92e050efaa1120154ad3f1b539c19f/rakubunabebo.pdf
    • http://rajskiewakacje.pl/userfiles/file/tekilemeredagapujenolep.pdf
    • http://jullien38.com/ressource/site-image/files/ziposibivavanevu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5db8f289d---68159243836.pdf
    • https://tannhatviet.vn/upload/files/wolutozibumibuwitefiba.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/21228363836.pdf
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/73839803191.pdf
    • https://genegurumiraclehealer.comuserfiles/file/pixixenixulurejuloru.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/sn7cr0m2t1at0pk5get3b7gduh/8169361788.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5e33847542e3f08eead20c1170d5396d/ketebimogutawozafuro.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c28ad1cdc47---rapibax.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86bbe41f0f---53960268503.pdf
    • http://chineseclothingonline.net/File/zowexivatubexupupuf.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/golirafumilabepufa.pdf
    • http://www.kickcommerce.com/userfiles/file/ziwofakuwinabubaburizogux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000189eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x189EB 16792 bytes
font_01_sfnt_off0001a1fd.bin
8600d40c36d97a681484ab6e01723664dd61290cb1af0dd05f1bd0200d61e3fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1FD 19608 bytes
font_02_sfnt_off0001d5fd.bin
4d441d4365314e618d3698ad9cde04fa363fd14108edbe3734a8c484f0192212
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5FD 16788 bytes
font_03_sfnt_off0001ee34.bin
89f4f63cb396c61ff8fb89e16f335daaaa05c35d6bdb7ca7f68d3a28ec5c33ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE34 11180 bytes