Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2844e92b383dc4…

MALICIOUS

PDF

91.0 KB Created: 2021-07-23 18:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d24c241201a973386da368337a21c9e SHA-1: bace97a1a33d75e865d0ffadc8a8464f3c2a3512 SHA-256: fe2844e92b383dc41c59f2ab981e08a5a94c7a66238657607ccefaa2367c5367
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://maribon.net/app/webroot/files/userfiles/files/fetewolokir.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/308e448944083781fac9e4a9b2f83da1/90619920199.pdfIn PDF document text
    • http://idroter.org/userfiles/files/jomitikibuxexijawuj.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gipimegidolosubo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f984dba9a---pediwitokuzabitoruwidujob.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/lefuwonukawetibovob.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d05f003307c---jonubosaluxetak.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tukigu.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021611724428813.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4dtd51g6uvkp4i9k87idmups5q/seziloputazad.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e208f8129335f640be5a4276b18a7c71/tafasijajariwopaxizekew.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a096bc95845fdf306df344aa40c1230a/46241085432.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3350c10687---baguni.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629efd4c82---ledexapoza.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a89fb05b1---77084659593.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fekiketabepalogubiwijot.pdfIn PDF document text
    • http://info56.ru/userfiles/file/79790168346.pdfIn PDF document text
    • http://proxima-design.cz/files/file/munimekalonozo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/08f42f7d5989c100a18342004d364fad/sumivom.pdfIn PDF document text
    • http://sukhabalka.com/files/file/55089378844.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/75033432424.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ufumuwamokorajite.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4lmv3bkeqpub8018s43o709s92/89141427718.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/44680833065.pdfIn PDF document text
    • https://www.andertIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+the+maschine+mikro+mk3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 18184 bytes
SHA-256: 52c202c1b6862d6d41142ba0f6d9ebe17603cdc6c143a20dd1ca894dd9b06e74
font_01_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14424 10892 bytes
SHA-256: 75503157c5361e63a606b7c404b36f8042890251e2875344ff5d2beab708b096