Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a42e33052302d2…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 23:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ab0531e17baad152a68656a3b77cb53 SHA-1: 3dfddb672cdb1b8f1deac9e0968967b78f60916f SHA-256: e3a42e33052302d24c1d694f60b824ef6ee548b294ad1216e40c07733b0df7f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to host or distribute malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=specific+gravity+of+materials+pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160956e5ccaac0---dujalatixonanu.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c0870f8488d1c330dfc685bdee976ee9/68346676249.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a5d02ea6---vamosixusu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a5fc492de9812ade01e2062a1b8cc4c1/38400996204.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67ef2ad93---luwelesusofetazup.pdf
    • http://ahchala.com/img/file/85562238057.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/35734208108.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb36e52e3e---kojimunotugum.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16096901254bc8---vopiwesixalopidirakoporat.pdf
    • http://dreiseengrundschule.de/files/92720990837.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/2210647666.pdf
    • http://aylincinarli.com/fckfiles/file/tumarejeferufagazifebud.pdf
    • http://www.cbs-emballages.com/upload/file/19595114858.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sfcnpfpc2va5ivhk0f1osbv7p0/53739089908.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a884f3684---nesigopanukeveba.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0fe39f5f---68455835811.pdf
    • https://sbsoftware.ro/admin/userfiles/file/48613033696.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7c78a6338d7e5182cfa4241d98064ef9/dupogu.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a60c4eebf70122eefae5e50b0d3f1976/22378446286.pdf
    • http://goref.ru/files/file/barusadivifejefisi.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/32951928547.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_off0000f26e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 16792 bytes
font_01_sfnt_off00010a85.bin
18c6312cfd2a92d848295664d3ab2894c10c3878cf9192bcd28f7c5782456d6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11112 bytes
font_02_sfnt_off00012450.bin
07f8298b9bee51edecbe2cda23f6e6d2871b571898118e767ecf352119d5a3fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 17776 bytes