Malicious PDF — malware analysis report

Static analysis result for SHA-256 8276d16c3cdbce06…

MALICIOUS

PDF

124.3 KB Created: 2021-08-17 23:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0fd7ce91ebbb161f2f84e918b53465c8 SHA-1: 1b6b612b02c7ea5f545ff3b52f37b6fc7a00c3de SHA-256: 8276d16c3cdbce06f0ca26a9dd14318166f1d87415972b6a927e1a5b3cc9de58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rallyteamwalraven.nl/file/fomorowaraxobo.pdf In PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/jedunebozevotelezozal.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/98dthuptapk4l11p3u2da9u667/75512614060.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/rewekosuvenefozutafaxo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tilusumo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ff0f6a304---64918627664.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607161d8d497b---zozadupodon.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/3014886079.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/15737967378.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/720e6b13f749a0f15f7e1d98efff73b0/76759961507.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd4d0fe8c---buvanuxapebelorerap.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/baluxezofexexowajubatutiv.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tavuwegapotadugaduzag.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/fusixagox.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/venigotijexajewemubun.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/48168503945.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gctdn7o8sl5f4p4nsfcrr2urc2/zufalab.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/pokitamafonenafasozaken.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/rasusimuxoxi.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/tekijonaletuzovav.pdfIn PDF document text
    • https://aashianarealty.com/file/pataxim.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/27691796855.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xudebutawuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ffxiv+dark+knight+story+summaryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000184ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184EC 11076 bytes
SHA-256: b5a18576a5cd71181ad1746463a22c24aa89af72812179452d601d1fc2f971c3
font_01_sfnt_off00019e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B673 16780 bytes
SHA-256: f7415d3c16542b48aeb50330fdcddfb7cdef8d97ace2a2ff39aea42ba10f8f68

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