Malicious PDF — malware analysis report

Static analysis result for SHA-256 89193f34c73ab2f5…

MALICIOUS

PDF

74.9 KB Created: 2021-08-28 07:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71806947090860318c6c5884f06bb18f SHA-1: 6220363dddc1965a346650a9233f69dac936b0c6 SHA-256: 89193f34c73ab2f571563d446ba68d8f4694a27a00a898dd6d8cd88b273778c1
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded URLs are likely intended to redirect users to malicious sites, potentially for phishing or further malware delivery. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/20h3vp8aqb9fd6s7ki37e2osro/63990839980.pdf In PDF document text
    • http://insureacompany.com/userfiles/file/tipokiwipimujoxemavow.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kupurakajanize.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/vitiputi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/dd4cabff0059459a5b67724a6f3ee609/20080551376.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/2485347949.pdfIn PDF document text
    • https://artbynela.com/uploads/file/fefixalevaxudirakixe.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5aedfe3ff176ac877e3dc6f4e3bbcc06/89626518894.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de265369c---58389880209.pdfIn PDF document text
    • https://tavio.ru/files/file/dubufuremuzadatetolu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907c6fcc0c6---86387962480.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/67856831797.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/noduzebujujuveli.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb41641cb8---vikokijikemudegifub.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/femerijubomifop.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wugajuzuminak.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/splhm6etp4hgloif4k0h8vv5q1/zolepawonozokujin.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xajimoju.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/509f502d4c37248ebcefb8c492b68d31/nedodiremedon.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/pifudeb.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/veninenojavozuxelawiso.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e3fc27e158b7caaa1f38d92f626bc39f/15385671486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=perimeter+of+a+rectangle+from+areaPDF 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_off0000c181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC181 16960 bytes
SHA-256: 592e80bd5531f443d62109daef2266215be9d170564c2aa8313f0e90704b33ee
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 10512 bytes
SHA-256: ce7a6b0c5b8b812c3a212ad0247b7082c0f565a06866b85fe99ecb19061052c1
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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