Malicious PDF — malware analysis report

Static analysis result for SHA-256 636d6b626c32427d…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 18:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 55ffac1ddbb7497eff914716710462da SHA-1: fe2ab1d35e30a06126524f89ba15519557de9f81 SHA-256: 636d6b626c32427d0ea52d919baa801aa04114ebac1f76cda343018f8ff56dd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=reversible+competitive+antagonist PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f98a1522d6b4a7e9fcb54294fa8a590a/52337896132.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/69597401993.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/87366601882.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bec55a4d6---bemenijag.pdfIn PDF document text
    • http://grabnerestriche.at/ranofixixasenofi.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/10882384969.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/nariwakiso.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/26125593920.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/95397470543.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc8a4af78---94147673835.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59fcca3381---94569061277.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tfuqndr3aourvslu9vd58p79ts/57903714542.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/50999032017.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b19cbe77a01---54007921459.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/dafemuna.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/26115609074.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096970e7752e---jogukewumolemisodik.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dec9519f0---64179629724.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/11608047425.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6948504434.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fd648a645f5a9680ef464e9aa5b967a6/keleworima.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd688bd174---66565824339.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_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 16976 bytes
SHA-256: b286fd2607fcfd07ac9b58f1a17025cf3b6baa6d3e7c6d12ad6ab94cc7e36adb
font_01_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 10968 bytes
SHA-256: 85341e920c955602778c19a4f1f92fe92508ea73958a84fd150d7a63800f7000

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