Malicious PDF — malware analysis report

Static analysis result for SHA-256 05503600457f991c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 00:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 923c33127ea91b5abd59bace8767eea3 SHA-1: 083590bd5eec9bb2c81b808bc4691914e2bd0827 SHA-256: 05503600457f991cf5c253ee8d50f7cd99fc98836c6c7cbb5addd8ee596ffded
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate a pattern of distributing malicious PDFs through compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f21d2c1b7de---relomulakuve.pdf In PDF document text
    • https://giovannicaputoboutique.com/file/zarar.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7p002jsvklltrvgv0kkumcikl1/77107175261.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/8589808441.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/noxixedi.pdfIn PDF document text
    • http://mextro.de/upload/files/77207376931.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/jifanikewisubixulak.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b89d08be8---mafapif.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/130217107051.pdfIn PDF document text
    • http://fotossc.pl/_files/file/78887151913.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/rixat.pdfIn PDF document text
    • https://daismene.it/file/jubilop.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/xogaxorajomi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5370ccd46d---80996166367.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pa444hm2nk15148ooop8lcvn9a/pawezakopirowesokiraxos.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f6d16d64---79386131946.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/7371760721.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae551cd8fa7---35728739710.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/fimugetedaxawegadorerulow.pdfIn PDF document text
    • https://arendic.cl/files/kofeke.pdfIn PDF document text
    • http://midel.me/userfiles/file/botuwimexupowozizo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161248493d1334---98335503756.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/06234d3a035ee47f8bcb62ba9a079124/33176703231.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088753e44ed7---limolavudope.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe7ed10f9---48464964633.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/42509049904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cortege+et+litanie+dupre+pdfPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 18108 bytes
SHA-256: 24759f5caed72bcae5b5702810fa15921ccbdbb1d3a8f3d71b3d5953e6e7024d
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 10636 bytes
SHA-256: aa46b435db123a4526ba3b2622b325f8b982ff6afefd0f3b7a85bc90f1c0ee06
font_02_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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