PDF malware analysis — malicious · a64cb5146e363360

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 05:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 498a5eccacff57b9da9fac8b2ad20e38 SHA-1: 384e32fb1d9296bee89a26e348d801c65e099be7 SHA-256: a64cb5146e36336056c799ea797739d338442e7ae0912f3e722db5fa9e5431ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, acting as a link farm to distribute further malicious content. Heuristics indicate it is a phishing-related PDF, and ClamAV detection confirms its malicious nature. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

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 https://allytemp.ru/uplcv?utm_term=expressionism+literary+definition PDF link annotation
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f5f8d695---damakuk.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8dfa166e---46152023109.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160734116836c0---vovesusabuvabigidugu.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7d190f658358c765d900759a3dda9382/semapuforotivatape.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b01da6d4118---56635016805.pdfIn PDF document text
- http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe523a023f---zaropipalakosategux.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb993c090---14342933206.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf6c231aa---58840161553.pdfIn PDF document text
- https://surupaceanu.ro/ckfinder/userfiles/files/6702531372.pdfIn PDF document text
- http://ptairsupply.com/userfiles/file/tisev.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900656ce558---62075602630.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c163f9dfc2---neduxirizepe.pdfIn PDF document text
- http://radio-salsa.com/php/rs/filesupload/file/sabur.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091276b6c12e---52859384218.pdfIn PDF document text
- https://leosservices.com/userfiles/file/89066809959.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9b92df49---xuvevifiliguzugelosazuke.pdfIn PDF document text
- https://novzelandiya.ru/ckfinder/userfiles/files/jadabugojej.pdfIn PDF document text
- http://erictex.com/ufiles/files/vuwinazaxoka.pdfIn PDF document text
- http://greenlivinggarden.com/htdocs/UserFiles/file/99695190596.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd110155d3---82509537482.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42297075a4---33025849759.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9edd13bb---89454017420.pdfIn PDF document text
- https://bnbcostaverde.it/userfiles/file/pidadalemagejizusatej.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/49880cbcc802613a3a1006a36b795fc6/35486781238.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_off0000f1e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1E8	10860 bytes
SHA-256: `de85cb90f89a0ffe3c747e3c50f3e69d2cea3a0aa4903277f6422f8e2aa5b243`
`font_01_sfnt_off00010af9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF9	17240 bytes
SHA-256: `823e543360de2e1c2583be4f90f5e65b202191dc9e52d665d0709dd4098c0524`
`font_02_sfnt_off00013760.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13760	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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