Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fbbf68999a597f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 12:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4cc65941f2ebe978fe52aef721f65d5 SHA-1: b58d1e0111720340d3d90b7c6a0ae0606f5dead9 SHA-256: 86fbbf68999a597f7b816f6c4e35db10c99ee19f407bd21d9d1882f010832f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains associated with link farms or potentially compromised CMS uploads, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked PDFs. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tutaylamhet.com/storage/ckfinder/files/84056548016.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/fifigujogo.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/86913789221.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/66917216335.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41326724b---12841668256.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/demeriponagebaveguwanox.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/23749450580.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/58190563348.pdfIn PDF document text
    • http://intergeored.com/upload/File/motiwepakizixexo.pdfIn PDF document text
    • http://asustainable.com/global/file/81678011576.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bce60440d88---15538333175.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607322cf3485a---71271439843.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/58719436550.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c1c890453f998d28b2290f088b43d38f/33123735253.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/dajesavujirakob.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/redovedilenidorezakiza.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/25280565457.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3c0992ec---30671430447.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/97007344068.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683842e06c---kijinuwafoviwoloragume.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/62396595550.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vebezibexutose.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/vunawexifofiriw.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061017083673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cghs+mandate+form+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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 16072 bytes
SHA-256: 79c5c94db13d00f8aad40b72d8673a9f7997d0faeede9b1a30d8be6578982db3
font_01_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 10840 bytes
SHA-256: eadcadbc5a2b0d39cf18d025197e010edfc9b8f2d258eed0291aab9f2609c255
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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