Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb88f850af70f1e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-03 09:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e32ba934d85e56541ddb7b4ced5f46a SHA-1: 89629f72a847fa4e5a9eb2a010e8510208cbe14c SHA-256: 8bb88f850af70f1e4189e9509096e1535d8daf0320f4a0f951fb3f8f31ccd9d8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=cia+world+factbook+russia+pdf PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/b4eddf7b190f76251d354d1bf65dfc22/defebenakuriwabevirisik.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-14/images/files/zomigewikuvosafo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161262111a65b6---46364847911.pdfIn PDF document text
    • https://priscar.com/documents/files/9128602552.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/28207347320.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b21dfd8e4de---99546160960.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/nejitowewezo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d9f16d67---totononagiwifur.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/tinomobunaxel.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/88598288230.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0b74549797bd7cbbefe894ebbc8c49b/mezuzevesajef.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/5609089471.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zikurufezinipoku.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/35539731552.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/62283760998.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1novuvaglfu7pcd26u1r6bf2j1/50912927582.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a35f55e9d---karoronomudilofuje.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6df6c096b---jisirimivabozezeji.pdfIn PDF document text
    • http://fitviewer.com/files/file/39479810374.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cafa0903---xuwokozise.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/wijesujuxunit.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lekudapukoxitagezusuti.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_off0000b270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB270 15320 bytes
SHA-256: 47dac23c000ffb5d82b0d55e55f5e915c6c0caffffce71771409d2bff691b7ad
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 10828 bytes
SHA-256: 0c6463e3f66eb46f57ad0aa88691b9b4d5e33fddfe724a93afffb07624d812e7

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