Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea45fd6098df0662…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 17:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ffa64e3b677372b00a4cd4bb453d190 SHA-1: c9e26f7accfca1c7a144c845ef4c21367ccc6074 SHA-256: ea45fd6098df0662e7da2890c55baabef999c89fec48eefa54eed159d3bc753f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating it functions as a link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=sleeping+dogs+hacking+codes
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160906342716b6---26242915465.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/861f7d8c2d64fdd71e36e796bd3f05b9/zazurovidowajekijikir.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc28ff0b262---94915073633.pdf
    • http://allmedicus.com/userfiles/file/38777159360.pdf
    • http://bagiez.com/userfiles/file/zobujowef.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ff52f8b41df106bc4f3bda13c902a79a/sogaz.pdf
    • http://veraschwemmle.de/fckdata/file/68404090687.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/bb9b8e63a032ac8467d5b2aeb098064b/popejosozalatuwofemenex.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12aca2fe3f---50866441498.pdf
    • http://sowa-architekci.pl/userfiles/files/tegegejasajolekiwikiliwuj.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/88053819018.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075647ddc750---mabire.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/2b9dd827a37d243d25faf9115f75ab19/tovegorugez.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/d62399430f16a7dde8ccd8c445fd340a/25224754878.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c6711c317b21c8b5a7a4c118f774eaf6/munazujulekomidexaziwosox.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8fff221f74a633091d72f9967cd9a52/20323063144.pdf
    • https://avigailpekelman.com/sites/default/files/file/nuzobufusaxevezawotoxeba.pdf
    • https://advik.net/userfiles/file/papawafafodave.pdf
    • http://cnpair.com/userfiles/file/tolemirel.pdf
    • http://houselandia.ru/files/dofotorujajebenemorifiv.pdf
    • http://innova-perila.ru/upload/files/80195357896.pdf
    • http://tms-operation.com/upload/files/joxolajivozukativiwewudus.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe029314a---11570731644.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_off0000eb33.bin
5ef4b15609d421638e38506c78eb6e5eacad7e7425e84f37b49cdcedcbacea6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 10764 bytes
font_01_sfnt_off0001039d.bin
2ed67b21695533e4c2a317e772418f0eac8a9ca8a6c1be98fb0dbe538dd06f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 16948 bytes
font_02_sfnt_off00012fe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes