Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a8292a87a834f1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 02:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c10bd86087e1f9e309b50f941e914441 SHA-1: 1d18dd5d9523da33119ecee1886dac46d4a9de92 SHA-256: 92a8292a87a834f1c4e514c7fb8e78fd8d71adfb01c143fd36f34dd4d1994960
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://massageindex.nl/images/uploads/pebuturajubuvid.pdf In PDF document text
    • http://droneducational.com/admin/userfiles/file/podaxa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9b188459b1727d9e6e7765672b27ff9c/zizujejil.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/53aa0771594db09452e9d70de3302c06/wumegenonasuvisot.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/48852108327.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/557053718.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/85869496168.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a3b8eb642a096d5a2b2583f9907d7907/99428599353.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/96042573986.pdfIn PDF document text
    • https://777mto.org/contents/files/vutiwirusi.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/36122726028.pdfIn PDF document text
    • http://muszempilla.com/files/file/kuvudik.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/40188732448.pdfIn PDF document text
    • https://12shio3.com/contents//files/deriwosupixuwemepe.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/rejizivasikukevaloli.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4d520b3a7147bf3fab7355d5c966fc84/nalefapatosejis.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8d679468---75948306176.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/1f3ed88f221c6f401e0563b9b52f6458.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/49479197777.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/24151351481.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6db04a6f---lanugojazefem.pdfIn PDF document text
    • https://penal-garazh.ru/files/67237283259.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/79615457008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=health+benefits+of+nuts+and+seeds+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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16592 bytes
SHA-256: 8bd5f18055e2ae456d9cd4865877ff2e9829632a8a6d6c8b8c9e56edc956705a
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10724 bytes
SHA-256: e35cc454f240ba49afd2c4412fc4c18e5ae460ee2b604b76561974b972d2fd82
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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