Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd58d52c736e08c…

MALICIOUS

PDF

92.7 KB Created: 2021-09-23 14:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a5ac12eddd8588ecbbd532d7effb4af SHA-1: cc6a5340755fad5bfe5f6e828dcf8f777936f63a SHA-256: 8dd58d52c736e08cdd0f149b35c7f6668837cbbb0878aaeb6e3b658f3aef21ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jagodkaprzedszkole.pl/userfiles/file/9939443322.pdf In PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/kuromitemukenerisuv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb7c0acafb---zalipekoxorufusasazez.pdfIn PDF document text
    • http://szm.hu/userfiles/file/gitefedavuvi.pdfIn PDF document text
    • https://quizai.com/uploads/files/68162644720.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/96718061093.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ppjern8u2rhcu6ce7dqdfc0egs/79573789430.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/23965320589.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/66796883175.pdfIn PDF document text
    • http://zgic.ru/!upload/files/569293862.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/32558585468.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210914032600.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tusitamigisisa.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/fopadifag.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0a8009299---saloxonasabavozod.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63a6b008852161c24775a6ceaf4eadb7/bidagijekaki.pdfIn PDF document text
    • https://anjingliar.com/contents/files/36510792742.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42238b4fb---bagufi.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/ruvoza.pdfIn PDF document text
    • http://apothepharma.com/upload/files/votaxekibosolumu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/50063111159.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///22184322258.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xijizekerikotake.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/9421338725.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kisapiladufetamozepol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=seven+deadly+sins+watch+onlinePDF 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_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 18644 bytes
SHA-256: 6df3c9a066613d6f9ec62ad41070a829e0a85733b865c6103e199cbe873416a0
font_01_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 10708 bytes
SHA-256: 3b516bb62d144fec42f5c1cfa1e661abfd5f7c80ec543acf978b2ee9f6b53b54
font_02_sfnt_off00014d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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