Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddb3abb2f892c12…

MALICIOUS

PDF

98.2 KB Created: 2021-09-07 06:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c6a4f6c284e122cc7c9c39d79ee3e75 SHA-1: 69e77ec3f3b43e5aaa572f832f8fc09fc80d9eb9 SHA-256: bddb3abb2f892c129b022621bdf0e4887dac69e431ac06887982f5a35b0c25e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. Multiple heuristics indicate the presence of link farms and external URIs pointing to compromised CMS uploads and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pistant.ru/uplcv?utm_term=qsc+gx3+amplifier+manual PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/69404981379.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/592b9a65932c6ab26219cb5457b5ce18/mufesijo.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/sixof.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rufov.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/28gnjpatf9mqcdg7or0fpsdnbd/gubufar.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/22143534321.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/92643446668.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/xizap.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/17161567423.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d4e4f3839e5128d7df3299267b767267/titaravewolaze.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/liq059ck5e6ks8tgqoub53c6da/7797773420.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/47723843440.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/91471514985.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078989f1ba30---kuwiv.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/penuzaxi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/kozokilaxuvogug.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vowetuwijipa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfab287bdd---71596981630.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/bewuzunezarenel.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d7242ca307fadd73fd5b89b7310a0fa/mixamiju.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609473537346e---xituwutise.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_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 11040 bytes
SHA-256: 41059a9868d722dda3c328b9025ffa2345fdca643f550151528ea7e7937db9bf
font_01_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EC 21488 bytes
SHA-256: 1822ee1f09198d6480a56f2fab451e99d0a66967131b10cfe15db5998a013870

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