Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ecf1fa7bd36288…

MALICIOUS

PDF

80.9 KB Created: 2021-08-23 10:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 219753d087d76645ec175527b55f4cee SHA-1: 0d53354a090515e7327f52c6f5e7289c8bf26953 SHA-256: 89ecf1fa7bd362887de3d1de11feb48eeb3ab7584085a11a7b1402e80a1e0300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=stomach+painful+to+touch PDF link annotation
    • http://klassn.com/ckfinder/userfiles/files/88089128860.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/xowovides.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/79260956113.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c8efa00d6a32e5d63bff4b0ad0911f09/dozebibosudezewumagopu.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210709073533.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/nawuwopuzuxarovoxawisatuv.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/7270797527.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/92919795208.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dff771bb066fb02411ae245cd43d69db/baxururad.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13772066847.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db64494595---fopoxorew.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/76593291454.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/potogabebovifijajuw.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/xovawiludujus.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pabogilud.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/galawubeposoru.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/fotejamaxijomikar.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160befd2413c45---mokemevizaradutumomaz.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8167e3b4b0c0f970dfdd22d8959019bd/97415063531.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/ferejurofo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/203fbd60b4fa559232b37d6abc87cff9/90995673559.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/19c51b27038aedc651d9e368f850d803/28897394770.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/semonodukofulenupuratafet.pdfIn PDF document text
    • http://korytnica.net/data/files/38927443234.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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10520 bytes
SHA-256: 820f49dcdbc25151e3076462931ec67041e4d7a111264e490d5e30130caf9224
font_02_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 15660 bytes
SHA-256: 30ec0b5723721fbec2a367fe76e5026235b86166a4a990b9045d0c2ba8353481

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