Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceed852048e5e001…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 21:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4cafe7c3d9dabbb2a40a0f9f5148187 SHA-1: d6d2a10dd7540a2ddbc88b85fea4c49313d9468a SHA-256: ceed852048e5e00188814ac9be5c5d7f5d55389da25d3bbff3baba175821b56a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the link farm behavior is a clear indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://studioriggio.it/userfiles/files/38428912172.pdf In PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/93985285319.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/61667657729.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1d67f8edd71ab98139aac553f483b43a/21327530905.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/110fba88a3e66c135ca9768915ee9d44/napebutulupun.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/972cc8a9000c2404137c48d9ae2c4a55/90931401737.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/xotikari.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/15550697080.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4626a2f456267a4dfd5f29daa0ab9300/12755626504.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d8c512fb---liwigosejadajujebexuwotup.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/vopuse.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b200b21d2c1---81124867385.pdfIn PDF document text
    • http://dhf-china.com/d/files/fokijuzubuwodu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080822eaab58---40932080226.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/85540807504.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d5d28435482e1a0630d12d78b19c567e/mimokazemimetuku.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ae41dac214f298ab7ea1c1f07322420/kuvolelewigafarojefo.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/rogoza.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/powuge.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609071136640b---47746532491.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/57095851250.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uo78nd1icoo32a06fvmgt3p926/nofar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=varuna+mantra+in+malayalam+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 10420 bytes
SHA-256: 82bd36dcaa2b55cf325bb6764447b2c0e90ed2acab71a7a878df860b84c6d427
font_01_sfnt_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 18080 bytes
SHA-256: 06183e53adb1e94ca094f896714a31bc1cc8b0b66887f80cc91205b40f3be399
font_02_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 16124 bytes
SHA-256: 2c21ff3ceeb7a5749d3d52712a08aca31fcce6c6a030d08a19a294d8f4050a43
font_03_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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