PDF malware analysis — malicious · 157926a31c27956c

MALICIOUS

PDF

77.2 KB Created: 2021-08-01 12:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: fca42cd1a70b915a42cb65b642677be9 SHA-1: ee0c3c5c14f26bcaccdde08afb2222a008daccc0 SHA-256: 157926a31c27956c1fb902df3eb107deaca925f927823ffee294c408f21d1e65

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to external, untrusted sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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 http://sklepjola.pl/userfiles/file/modirilewulejasijomuzafo.pdf In PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8baad162c079454982b4c1a92cb635ce/64704199049.pdfIn PDF document text
- https://havanic.com/cache/fck_files/file/28201995896.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/87469023834.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bfcefde9d4a6e07d9f7b75a3b238448b/67041525904.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/87o6cff374jhvtss1olvga8242/52565311286.pdfIn PDF document text
- http://nationshield.ae/userfiles/files/gasomalemujexinanotubigax.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-5/20210505174730799664.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/79352831101.pdfIn PDF document text
- http://eksan-ltd.com/userfiles/file/21640049911.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e7d548f4b72b8a7e7a1b02041016bbe7/vewulimisogilupazagoxeniv.pdfIn PDF document text
- http://luxe-pools.fr/i/File/26953417199.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f809ce2687---bizekuwo.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e32c080e---gasepodegi.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb3e6853d---23245057074.pdfIn PDF document text
- https://mobiligennari.com/userfiles/file/vixevapo.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2fa5dd05095bee992ed2b287484deda1/dimavotolow.pdfIn PDF document text
- https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/021347831e7f3a6f286caf52076f35f1/85710254863.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1587892b---21590838971.pdfIn PDF document text
- https://we-plus.tw/ckfinder/userfiles/files/koboxanaweka.pdfIn PDF document text
- https://mariellatriolo.it/public/file/wipawabo.pdfIn PDF document text
- http://pcserviszlin.cz/ckfinder/userfiles/files/40984859591.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6921d3f485---8306118618.pdfIn PDF document text
- http://cityclick.it/userfiles/files/zujusa.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ompla8l6ttucl3cv9nq8bbrb00/32266057871.pdfIn PDF document text
- http://vmkmsz.hu/userfiles/file/39310868372.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=domino%27s+pizza+menuPDF 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_off0000ca5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA5F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e271.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE271	17216 bytes
SHA-256: `84580157c1dabc207a9057bd86c4fae432db10bbe937369f18ac08765424ccc5`
`font_02_sfnt_off00010ece.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ECE	10364 bytes
SHA-256: `dc6a5ae123aad98f6d98cd8906877218db5542e2ac9c1b6c58ad2382e3a9349f`

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