Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ac5d93d053e9e6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-28 14:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a967a3676f65fd7fd091c2bdc0921b4 SHA-1: 7bb4ed83c0eb2846108e3e35e6d4a108f07ebf39 SHA-256: 67ac5d93d053e9e6f661f24ebda1c302361e67524c699f57bdd70b38b07296c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tortsurprise.ru/upload/redactor/files/94187799349.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7cf8ceda3f3b80ec17fb0e3d512e6367/vokiwofa.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/tikefimabebewejekuz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6d41740a7eac50a32282715664433e3d/25834881182.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/30891567257.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/810f00460295ab90f50cc5cd1e2bc6d8/rabamerukadurukef.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3piesagaj7d1epgofath6bg8d6/wobewevubokazovim.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/24859242452.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b0a883237eea356e3fa683ef4e89a0a9/jozemo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/nijobopotigiparirew.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/lanoxaxene.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/nisewavonamiboso.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/63607118814.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b408d17bbd35890b740c25a4200f91bd/37735124557.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4bb5d591d1b947d3fb767f0d9b13d8e9/rigowamelijojeme.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/13111313207.pdfIn PDF document text
    • https://actorconseil.com/files/file/tigopinatajizunab.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3781746ff8---31214474107.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1080e6958d9bda6b2f5da6691bf78f89/28089729134.pdfIn PDF document text
    • https://partnermind.cz/images/files/97761506297.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ef65f03652cc97e4ab36c09030f08fab/90387536270.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e65d71522e263850384fe6480c1c3cc1/luletinonubaxurexifizosu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8fk8ftmun5n27i9s6qs024g8k4/vavukinogeburunizijerita.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ce90c190---29569338531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mobile+caller+location+tracker+app+free+downloadPDF 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_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10756 bytes
SHA-256: 56d667a0cf2bc952552596e5914c212cdf702946711de9bce0a0b907e164510b
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 16784 bytes
SHA-256: 841718e2170a9020c592b77e93ae36dc9c075eddfec0e6c713c4a8e0e34bd878
font_02_sfnt_off00013cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1