PDF malware analysis — malicious · 1d28f3c5c7c28e48

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 12:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 378efa6a0bec6b003b978acfcbdfcc31 SHA-1: c4f35685f4549540cf95ca9a768f1f545fca2a17 SHA-256: 1d28f3c5c7c28e48df332e48f2f68bcabf1d0f000cfef14e94cd1f7abffb48b4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall detection pattern indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://infrive.ru/uplcv?utm_term=use+of+redstone+in+minecraft PDF link annotation
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ded788c4---wimamukavetelinipaz.pdfIn PDF document text
- http://silesiacapital.eu/data/file/71747169147.pdfIn PDF document text
- http://losmarinoslanzarote.com/marinarubicon/admin/file/zutovagi.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b001d1b4de---jawatetedav.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ttovc051696gbigkv0oveqcott/74641098880.pdfIn PDF document text
- https://kund-in.com/userfiles/file/rukurasulipu.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832a0c9fb88---99219258760.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09882a727---76754506938.pdfIn PDF document text
- http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/63b2fe2b31ebf9d79f6a1c17e6b90083/6112053787.pdfIn PDF document text
- https://ecowaytechnologies.com/ckfinder/userfiles/files/53567699546.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/88281842153.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5acec6ff1---vojubexubegamuf.pdfIn PDF document text
- http://traviet36.com/upload/files/sugafewuwa.pdfIn PDF document text
- http://moreit.ch/productinfo/file/lomirole.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad1baf246---nesazomekafoxa.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b86943963e8071b242e509cf10998da/74055198039.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0451fb3d3c---jufotululakekowenuni.pdfIn PDF document text
- https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4bbb2236---23859079579.pdfIn PDF document text
- https://termoformat.md/img/files/62708353185.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a685407b17983adfbf71bf05e4a21bbb/28539241231.pdfIn PDF document text
- http://nt-module.ru/ckfinder/userfiles/files/64701145328.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/42lt4qbace5stomom3c25i7pa7/58537343803.pdfIn PDF document text
- http://www.petercar0937494634.com/upload/img/files/xesote.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9264f8db77---53466779747.pdfIn PDF document text
- http://global-insurance-broker.de/downloads/popas.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6d29a227e9cd629d956801802d079551/ragazusifokotuw.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_off0000eff9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010810.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10810	10596 bytes
SHA-256: `5dd2b4264e51e4f506ef5308fc9eb57b999146791b08366125ef72625fda49a4`
`font_02_sfnt_off00012046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12046	16948 bytes
SHA-256: `2cc939c75a4023ef45a95ca8b5d3f78f3c8fe23cf08d1f0e455452b2d01eae8f`

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