Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc412a9db8bd5d…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 10:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd17db36cc2cabeb10a01acefbfcff2f SHA-1: a4c0d83eb2e63197f32c2ec16d62c422ed90e00b SHA-256: 3efc412a9db8bd5dd15a6df6317155e06138543ad5057c8fc9c4bec006c667b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure suggests a phishing lure designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a123d258951---42298137283.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0a2a95729cd9904fb3f68188a163c7a2/69759984861.pdfIn PDF document text
    • http://normel.org/files/upload/file/67877657352.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5b7650e8c8550a0f4c8bb74de328fff5/metipurojapujubu.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99589106650.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8dc222621112b0fe3e1a630a7fd9ba77/6243795158.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/19615416266.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cee1d56d9---sugafa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/8799961872.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/gesofedugixozoxur.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eece1e221---7268669233.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2862e35c07e933c4df16c3a1a02be9a3/50622355493.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b7737c064263e4b8b7c8042b2301e070/68707023485.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/jejuvapevepi.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162491964054473934690.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/61921114468.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081024e236a8---venaxukegos.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a01deea64---75967930956.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/96352778095.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/59041515940.pdfIn PDF document text
    • http://soupworld.de/upload/file/4164209468.pdfIn PDF document text
    • https://tajeer.co/userfiles/file/fozodoxeboritogufurigab.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c36215dc3d9fc3f8dd91b900c02e3aa4/pizoxadekanilusegekonop.pdfIn PDF document text
    • https://avvocatoboretti.it/file/77149594006.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b7b153e9501456904c694df598b19226/gafawiziruzinirapedikejol.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4f8c4fa47---xotakuladefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=anagram+of+panesPDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10444 bytes
SHA-256: a6ee13da69242711b8adf365c0da60d342dc92d34c33cc1c9e7007bb10114ead
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 18440 bytes
SHA-256: 4169b9fb9fb078fdee3a3b69141495bcf38686e3ec7490d5f589e3261632c0ac
font_02_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1