PDF malware analysis — malicious · 9abb183d8a8df677

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: c7933fcb9024e56d5ee101195398da29 SHA-1: 086343250ca1cf772cf4fab284e1d4c1c127d489 SHA-256: 9abb183d8a8df6775e13bc099b42a43e12365c2f09b0485f807f94b77f529301

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm on compromised WordPress sites suggests an attempt to obscure the final destination and potentially host malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328119e1442---40595857174.pdf In PDF document text
- http://hmed.vn/upload/files/77327461901.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ed5d42f681698ce91b2e8cffdd5fe3bb/surexurezadakekalogu.pdfIn PDF document text
- http://solmoda.it/userfiles/files/8599050749.pdfIn PDF document text
- http://sushistoryus.com/uploads/files/8568681806.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/97dbc9a9ef37d2c853aa7ff5aea3fb99/vixopaxulede.pdfIn PDF document text
- http://paradoxine.com/upload/files/45292270075.pdfIn PDF document text
- http://umrllc.com/userfiles/files/83075283267.pdfIn PDF document text
- https://designclarf.it/file/basijekikozokike.pdfIn PDF document text
- http://les-dvorik.ru/userfiles/file/10415776303.pdfIn PDF document text
- https://langumeistras.lt/i/File/50761444040.pdfIn PDF document text
- https://beysukonaklari.com/ckfinder/userfiles/files/85658142873.pdfIn PDF document text
- https://groupburuemas2.com/contents/files/46824040323.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/dakevupoboxa.pdfIn PDF document text
- https://epagneuls-bretons.fr/caningest/images/file/63250059974.pdfIn PDF document text
- http://babyshelter.net/assets/upload/files/rekepesikamezedepidazexo.pdfIn PDF document text
- https://privatecambodiatour.com/userfiles/file/4250118973.pdfIn PDF document text
- http://zagazzo.com/userfiles/file/88894819328.pdfIn PDF document text
- http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/17860962161.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f5af74e720d25bb4170a36545ee44477/vupogikozo.pdfIn PDF document text
- https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/25021538868.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/99d05740ad2b164e3e63f7e36b6c0367/21311064874.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6058a4d9ca9ef2f3e60b5fb8cc43e9fa/rorojimopepirefon.pdfIn PDF document text
- http://guoyangmoju.com/userfiles/files/foziwelumenemobadew.pdfIn PDF document text
- http://ambvetesopo.eu/userfiles/files/gividasufixogebovem.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mx+player+the+nunPDF 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_off0000c3c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dbe0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE0	10280 bytes
SHA-256: `e58d4161655ee391d95808be08957285dd40d093e6b95c7cf023aff946a43376`
`font_02_sfnt_off0000f2ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2FF	17060 bytes
SHA-256: `588951248824f058249f559f37e72cf6ea223ecdab12133b17183a3284a2c581`

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