PDF malware analysis — malicious · 4943431d0aefca15

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 10:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f86308b3733cf21d4a1c22a02b92e868 SHA-1: 141f32608e8667da4b1d8e2e6f962f64d493dd34 SHA-256: 4943431d0aefca1568098b9df00505252f1a9e64b5fce7b7972ca4f94f6176bf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised domains. The PDF contains numerous external URIs, suggesting a phishing or malware distribution attempt by redirecting users to external sites. The embedded JavaScript stream is a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=mechanics+of+materials+pdf+nptel PDF link annotation
- http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/jefitudoxitulomote.pdfIn PDF document text
- https://handinhand-daycare.com/ckfinder/userfiles/files/31026551312.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ffc1e9f306ec163f7934d0e562d1ce88/kawopo.pdfIn PDF document text
- http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/wifujemigesobukobatade.pdfIn PDF document text
- http://yoron.net/up/files/32355960526.pdfIn PDF document text
- http://studiomalpocher.it/userfiles/files/xinigat.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/75093752926.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/43841585633.pdfIn PDF document text
- https://serini-cloud.pl/uploads/editor/file/90344140109.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6d529147f086a5bbe3fc9aae1f7aefca/77819206696.pdfIn PDF document text
- http://hai-bi.com/uploads/files/202108171556498611.pdfIn PDF document text
- https://kingdomofgodmn.org/userfiles/files/bekemovup.pdfIn PDF document text
- http://aokisuper.com/ckfinder/userfiles/files/98959247097.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8912130a84dd28d7e5b47dc4876f05f4/87967116709.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160df0884b658c---xuwuxutowubezejupafin.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2174ee3bc6---57335276374.pdfIn PDF document text
- https://baobihungphu.com/media/ftp/file/55766961067.pdfIn PDF document text
- https://maychieuvinh.vn/upload/files/49171240548.pdfIn PDF document text
- http://tipkeo.com/js/ckfinder/userfiles/files/96558612783.pdfIn PDF document text
- https://edcasys.com/ci/userfiles/files/11543108844.pdfIn PDF document text
- http://vetportonaccio.it/userfiles/files/misavaluti.pdfIn PDF document text
- http://theffirm.com/userfiles/file/11968642061.pdfIn PDF document text
- http://soeurs-scjboran.fr/soeurs/upload/files/muviti.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/51bc2dadc5ad320d44605e54cb5c662f/rixawaxovemasa.pdfIn PDF document text
- http://tvoirostov.ru/ckfinder/userfiles/files/67968725777.pdfIn PDF document text
- 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_off0000ddf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDF5	16540 bytes
SHA-256: `19233cf69c9569612183c6d8a340fa2f1b075cb71e3b46e59c6f13c39066dc97`
`font_01_sfnt_off0001087a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1087A	10880 bytes
SHA-256: `84396b7d73ac143ccf7e481ef003be0d64457ebad25646c0a2eb2b958559178a`
`font_02_sfnt_off00012169.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12169	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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