Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d8759c43ed8380…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 23:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fdcc9de6dbd04b45c0392b7abbdb0887 SHA-1: 71cc5a9b2ab48bccd09501588b678da7f1717f13 SHA-256: b0d8759c43ed83805b6da7258102d6ec036810239e3982da428fa4e768f1d683
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous external URLs strongly suggests an attempt to redirect the user to malicious sites.

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4e185f16---nusepufa.pdf In PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/64708187858.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/78212848684.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0fefd19cfe1de30be6ec6bc6061f0a66/datexefotadamekemerud.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380feb10d06---82747527682.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a5b81bf5c---3822306987.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/jutajuje.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/godid.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/87311627971.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dewawojo.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/pugamubami.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/pinamatefikuvulunibedima.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/pubaxopodesadaxamoloxaru.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bd0339a89dca9aff77a1eeaec826e8f7/fafatawokokureluk.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/97910087857.pdfIn PDF document text
    • http://ccsl.asia/files/kunodimekujonozelawanix.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/wunika.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1dd6290d---63536226012.pdfIn PDF document text
    • http://a899.net/userfiles/file/38512863781.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/fufapumirumafebakuzuluf.pdfIn PDF document text
    • https://anup.bo/images/files/2318082809.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b44f9ac3b11f683e495c458423551f7/85953929737.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156f9831c3f4---45069144620.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16157457eccb3b---besekagakutikajetimet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=alleged+offence+meaningPDF 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_off0000b2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BD 10436 bytes
SHA-256: fe05b6d5a6f2ce50110b8c72dfd3e4e19bb66bd69428cae975b814f233d16a03
font_01_sfnt_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 17244 bytes
SHA-256: 9e9c409583ade394301a906090f89fa812c7b95e46bac52816aea1e5510fbdde
font_02_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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