Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2588b0d44933ee…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 04:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d152112f84e1b02a2d144294507468e SHA-1: 1910fde08bcdc40ffa7ce0587346968cf20b1150 SHA-256: 3f2588b0d44933ee8b1fa0bd15558ac6d7c0912e8fee38c3df36e63b968cebde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://frigosztufi.ro/ckfinder/userfiles/files/jelifi.pdf In PDF document text
    • http://linker-apps.com/files/bevep.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/68974736790.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/jukenofilobokenasuwageni.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16169879471.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910030917.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/figaravukona.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7bb16a84---57161310238.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://mutamobilya.com/images_upload/files/15804485618.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1315ec201---10337202422.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/12423198743.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/45510794183.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/87779966410.pdfIn PDF document text
    • http://lse.hu/userfiles/file/76116839207.pdfIn PDF document text
    • https://mimpishio.com/contents/files/47040956825.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4eab2a95---12106927455.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/97123665648.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/98372223617.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8867dbaf---60438734512.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/lonix.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/17785110875.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/guxalo.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/43763762061.pdfIn PDF document text
    • https://songhongresort.com/img/files/12025870885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=structures+of+an+articlePDF 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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17348 bytes
SHA-256: 14d4b022925ba355201ff4e001a2c5a57ef3d01303779f08ec254c9a3bb25581
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 10504 bytes
SHA-256: d1f32c2886fa0b7566610ddad92ad8d13b1edd96c028ea372cbcead095245ba5
font_02_sfnt_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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