Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57623f2a1ca3aa0…

MALICIOUS

PDF

100.8 KB Created: 2021-09-04 23:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d865afa619a5aee3e61e9000cb080803 SHA-1: b151395e995bb35544cb9fc0888cb441cc3c3512 SHA-256: e57623f2a1ca3aa0b0ab2b313788e321fdb5e88cd4ead7e00a53abe55f2c0bbd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=asvab+for+dummies+pdf PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/edmqv0fqvir7abe33h0rqp04il/disukulorasawi.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/firiweferajasuwow.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xupamid.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5vrd2mdgg9571d6f8j2qdb8ols/91559802593.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68bcddb22---gexizifemi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e1e492948ea126d4ccc05c9ef355e4d0/68407449002.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/40785738729.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210828054704.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/29891606412.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/92730255968.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/nefumenesozo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b46835a6---gofufovumomi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65f034845---92889357609.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kmsnnlh5qn54un9poa2vf1vb1n/kisulugexowu.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/70590686972.pdfIn PDF document text
    • http://info56.ru/userfiles/file/puxalarabavusawibemogiwef.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/38336290473.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e71868a1f---29641115934.pdfIn PDF document text
    • https://epiphanych.com/images/file/viboroligelivotizet.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/28326992093.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32f527cb725027aacfc0b90f12f2abb0/moritekinaf.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/95481813826.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e3fcf7422c0356de32cbedd6e984f9ca/wiwitonadizoropovimipozu.pdfIn PDF document text
    • 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_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 18064 bytes
SHA-256: fed2c140ab860457825faaff3f3e819022b41ba3cccab6eaa8ea64feb70df1ea
font_01_sfnt_off00015530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15530 10700 bytes
SHA-256: 5b02cbc4eb05887fc5d9eb0bdc0cdf4503c30ae42c18e01f73a91545c8039bc4
font_02_sfnt_off00016d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.