Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7ba03eccf19edd…

MALICIOUS

PDF

85.2 KB Created: 2021-07-14 07:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c110398133c0ac3db2816479df8f9b3 SHA-1: 4faafa212cb9ebf09fc883ff473ca01a74363fef SHA-256: 3e7ba03eccf19edd68fd3baaa4a20663f2a2b18a4e7d31801405816f33efa846
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=3+strong+bases PDF link annotation
    • http://dongfangguohua.com/ckfinder/userfiles/files/95905717347.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7f3347f67a2d3e5169788edc7e1ea1e2/64790073267.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f8b2aa0299fd2131ce5746853cbccde/72871369813.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ec0e345---13016530816.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/73a8c009d60d3695fd350000ed705901/nafaku.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mewivoke.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6dmkt2l2g2uflidvdc7cohgjkb/digilipu.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tokile.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/tuziwonegufawojibokupagat.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cf019908183---93254902026.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507063507357029.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6e8696624b850c2bb40cfb5d9ec9e2a7/fewibimugekesifoluwodove.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/39096258216.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b83000d13---35686276762.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b21d6c9df---6955810925.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/29056739572.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e391815b422---fodofijadudosufupe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609885b4c37da---sotuvesotuzumiwexurite.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/65213994698.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/30577919733.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b6551013---41423535647.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/63804388072.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6e6d5a34---71354573002.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/zokuru.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/17146397422.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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 17096 bytes
SHA-256: 78c94b17b062fb78af587377f225edb0f772fa70a760221683cf31aae42700a3
font_02_sfnt_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 10360 bytes
SHA-256: 0992fcadc7d6bc5a745fdfbe928ffb7995c114be09ce9cf2e32bb7ef2a300f56

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