Malicious PDF — malware analysis report

Static analysis result for SHA-256 4364bfc3c136377f…

MALICIOUS

PDF

82.3 KB Created: 2021-10-04 12:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3560a43c106c686a88bbfe9e370825ac SHA-1: 3503bb0242dfffaf3130883fe927627d8d296d26 SHA-256: 4364bfc3c136377fc9cc213bc45cf015bc555fbc6e9b0fe859fcdb3a4f992017
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ozmutludokum.com/userfiles/file/88650980144.pdf In PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/35631099475.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210928_111315.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/21541235368.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16158be9e2be1c---7542493402.pdfIn PDF document text
    • http://bakoca.hu/files/file/rukaso.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c38375a14104dbfb73581c92632d47ee/46491691475.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161529f3316397---8320631857.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2306bf72ae810431a83ccac85cdb6620/86908151504.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/poguzixozokuf.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/03e1294cc347583fbc1384d456a47a0b/61280197370.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342da2c5fc8---36173463339.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/34838985215.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/kikupanivefavo.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/joreg.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/43164590011.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ad8b45e7c---88742331413.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/3022988183.pdfIn PDF document text
    • http://spakimthi.com/upload/files/75510289650.pdfIn PDF document text
    • http://porebaw.niedzwiedz.pl/upload/File/31194473553.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jajopaje.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/71095041168.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/benefabofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=burping+and+farting+all+the+timePDF 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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 10808 bytes
SHA-256: e21d90c8f559951092b3391c04e5bc9b837920bd23d1d4ce8198d6e5d51c031e
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 17244 bytes
SHA-256: 496cb9139ff05844cdf7f3ee68917a2e8b65b77a3abf8e276cdaf2d088a72cd8
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1