Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a8758d64772518…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 06:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1657ba20b28c5893c92cef368a0eb8e9 SHA-1: 977f63601b0da161b1b018912a4ffc20c3c563f9 SHA-256: d6a8758d64772518124d281fb52f042fd09091a9e367b7cceee1ae6569905ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, including WordPress uploads, which is a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3be45e4122454a11b0971e05b0cd5589/nalelifopo.pdf In PDF document text
    • http://easyhypermarket.com/userfiles/file/vexamure.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210601_49897C05E33EE0F6.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/59843643207.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d200350f65---24882898086.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/03ea5f5c11f1a004b47ccc7576c33eeb/2340997134.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/37629afedb1d8b2b9d7610774a59bf84/95152181970.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/n9k32rs7rt99722enlkj9fgiiq/xaliji.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210810_8CE2E881D31973A3.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1961ee4b46---foxapotolurugi.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/xajesedurazuvatuxejofud.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcdbc1275---voxopumavebapidibivaxof.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/guxepowowe.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/82434683589.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8552684bc5---4914429997.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/37852081448.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3a727438ca423fd0f9e557e66267a68d/68818000661.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/vewonezaturisifiruzun.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb27df243a---23915063276.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/33173748952.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/69431216472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=navigation+lights+for+ships+pdfPDF 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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 18264 bytes
SHA-256: a699eba6e508cc3009e551104e37af03d350f6df37a87c522bb1ce20474857f0
font_02_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 10688 bytes
SHA-256: 502e45e66bad571d69d6aa4e09b154f67e4a598f465e7e6fe03ce9aafbf15601

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