Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7ee81029f3bc2a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-12 16:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05e8595cf071a4050417f8db67ef9208 SHA-1: 3e71ff78edddaeebccf12c851d0142905ca8cdf2 SHA-256: 6d7ee81029f3bc2a6add0db40542f30d0bda1dd69797c22dbcd0a716ba1cc1f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic to redirect users to malicious sites. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, strongly suggests an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=instagram+private+story+view PDF link annotation
    • http://bouwbedrijfansing.nl/userfiles/file/mebesijekenodaluboro.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/17261307582.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091020440580.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/poxalonodurozoxu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/rafukusaguravemazit.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/39757886186.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/jitadipito.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/worokimikamaketub.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/59889023431.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/10800046896.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0133a83841e819d8cefa2fd85915a508/42543808951.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/pixivosoxorowixuwex.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132edde92c76---3838219692.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/44084167725.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/zinivizow.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f98a94677771445b1e4742cd61af0932/zetavoxulujurogek.pdfIn PDF document text
    • http://birdwatching.sk/media/file/40092105770.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/xegapumifikoxiwuwoda.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/jerijuxadixukudigusu.pdfIn PDF document text
    • http://kammed.com/userfiles/file/50516745151.pdfIn PDF document text
    • https://tcremich.lu/files/files/wejibetebuxaf.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/rilokokozalesalefi.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/78493203383.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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 10764 bytes
SHA-256: dd5f5eea9ac45a9826354617b5b27ab9a7708d11054329a1201b9df38cdb5822
font_01_sfnt_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 13536 bytes
SHA-256: 5e15b011c00cc0b7d9b3b456ea287940d2ec1ebbbae06a98a963f92996190976
font_02_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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