PDF malware analysis — malicious · cb37640651d9a92c

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 11:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: ee8d56e8d0e7bcb705dc3dba054fc265 SHA-1: b3e4a08632036b152d198c45c5f9ac06e159bf63 SHA-256: cb37640651d9a92c24c93db3bcd7e751d76ae6bf4a6ae84cb0c24775801e96ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to farm links for SEO manipulation or to redirect users to malicious content.

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://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/2r36tu0osaajah2fv2qsn7fcjg/notojinuxuxakiworesoba.pdf In PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607032848b3f2---7780167449.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3abeb7---36415114334.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/48666003284.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b060bdca86a7b2b5efb18258cec2750d/rekotokexozitavamus.pdfIn PDF document text
- http://dfh-consulting.com/userfiles/file/24133423687.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/87c721fd5393e184843b6b2e79fa9a37/romodaxexowasebep.pdfIn PDF document text
- http://tutaylamhet.com/storage/ckfinder/files/87104930583.pdfIn PDF document text
- http://toonesk.com/upload/zanurijage.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/56475345901.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/galutuvonitexurori.pdfIn PDF document text
- http://cristal-in.fr/userfiles/file/xenogaro.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a417d84e9bb27924a3eda2efa5d46b00/fopolifetimifizubanodofuz.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b41de8e077f95c1fa3ba371025ca686b/repazu.pdfIn PDF document text
- https://xn--p3t29jo1ed4o4xw.tw/upload/files/japimanezegafalatedepax.pdfIn PDF document text
- http://alliusie.com/userfiles/file/5083696561.pdfIn PDF document text
- http://thibangoto.com/app/webroot/uploads/files/97918559668.pdfIn PDF document text
- http://iwishop.hu/file/39154847573.pdfIn PDF document text
- http://interstroy96.ru/uploads/files/73420696313.pdfIn PDF document text
- https://minlinart.com/archive/upload/files/lobamuzifekejenipir.pdfIn PDF document text
- http://i-daa-wl.de/userfiles/sedakafafazomuwigo.pdfIn PDF document text
- http://yogo110.com/userfiles/file/rulitonajarepigafipepaxo.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8c668ace18e082f7f06556ccf92c4d34/dosonunijepozazi.pdfIn PDF document text
- http://veitali.com/upload/files/25314553236.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=delete+iphone+backup+from+pc+manuallyPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d926.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD926	17844 bytes
SHA-256: `7a22e8852a17af98c7e5208188f4c8e3e2d6c11528b23fb8c1543854665fc2b5`
`font_01_sfnt_off000106fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106FC	11024 bytes
SHA-256: `d4f612c0240ece7763cb65405e01a0fde459e6d1dcd47fdc2fa5e0d94273112e`
`font_02_sfnt_off00012042.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12042	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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