Malicious PDF — malware analysis report

Static analysis result for SHA-256 e605dda5cbadda8b…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 911226f54eaae9da0d350f7cd22bcd3e SHA-1: 45264201fe884fa9b9bcaccc6c664b255f6682ea SHA-256: e605dda5cbadda8b2fd25544af36624db460bf9e3fda24bea118eb500f4c0035
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded links suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://industrialdevices.in/uploads/89867652335.pdf In PDF document text
    • https://vandolderskb.com/images/usr/lawolorimuxaka.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4rtn0dkajmfkdmu7s8qojoduo5/saxidinegob.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9e46b52c---39086253085.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c87023db0f9f5efe997f81c15e10d98e/wijelokujewamat.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77203d85f---xawufegevutetunaromabebiw.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3b6c1e7a89893d2efc548897706dd8ae/96569695118.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/247117e02ad21cdd1c9207ffaf838f97/35153155102.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/62660303210.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913a2a4af9f---23779201310.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f05678f3---45352687268.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d777b0691be---65269483563.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/92242796685.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gf61lrquje7upg9q8k1vj0pm30/99153662855.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/valimada.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c5b7b69d0---84393737421.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/30035254045.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/vazemivoda.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/zalusirufavabenes.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/piwusixuxipilisoxogoso.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d847b99e6471efa58cb6212867ba08ff/xemujonimuviwo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/69102094071.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf48a95bf43---11939865361.pdfIn PDF document text
    • http://gyobel.itpublic/file/97171185825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=class+10+english+first+flight+chapter+5+question+answerPDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16680 bytes
SHA-256: 77125e3df33569a3e2ac8e2d2217a02982485324b1e8bb14b645348bef9c31ea
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 11428 bytes
SHA-256: 3ba1fe7166f67fc9795a7e09dd29f847433a9c61f8ea5412133f0fcf9bd06411