Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c5a21804d9ecd2…

MALICIOUS

PDF

74.0 KB Created: 2021-06-01 01:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6736a82a30f739aeb094d7f3100bd5ca SHA-1: 8fc75668bdd3b81e4db99098fb86edc12876fa44 SHA-256: 51c5a21804d9ecd28f63415c30ecc034f96b6cf068acada079a742c04eda2731
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e67d7b61b---puwugupisilozitofaxovij.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/toxikopipebipejimolizano.pdf
    • http://classicalgardenornaments.com/uplds/file/3833850198.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/323b65a5dc7e76ae8d42712946b287b2/23175679287.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pdp517ofrglndut5o9bkis87km/32042559765.pdf
    • https://zahnersatz.pl/userfiles/files/32376552879.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae371e54f9---vebawitadizexopulixate.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/548ea5cc959dda1b641371893478fed0/wuwisusip.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77272a15b5---mugepulolunar.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/qmru947qqubahrrm8omegm282r/66105603473.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9f8a672f84e4a2aa25c1d35985439fd4/49947517994.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aurji0060c1tsevnoj45nivpn5/govevizulegisejomujo.pdf
    • http://arniestribu.com/campannas/file/71973361670.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a0d7a05a---26469431365.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3e114de0ca950720fcccdd0e22c0e6fc/zexinikakixaloruzut.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3bdf7ef218568a13276c14338c201cf/maduxusamiwemeduwoneziki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sinais+cl%25C3%25ADnicos+de+trombose+venosa+profunda
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df48.bin
08163181993d0e13f71564132086f726eeb326d94665524c9a97388112b6ebe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 5660 bytes
font_01_sfnt_off0000f27d.bin
118ae50730b5abc03861d8dc69401cd6262a19f3e4dadb5fbe8b5f195eee8852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 12388 bytes

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