PDF malware analysis — malicious · 818db036e2372dc1

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 11:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 0a176ab5f3a781a1a26c2ecc861fe0bd SHA-1: 30346aaf423c7febb2fc3d35fedb1f70d9b6b270 SHA-256: 818db036e2372dc168a46c7503f9cd5349468660d4a5046408f299bbe655ccfb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF's structure and embedded URLs are indicative of a phishing campaign, likely attempting to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=17+laws+of+soccer PDF link annotation
- http://zoop-tech.com/ckfinder/userfiles/files/19090125906.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee01ecee3---zezikow.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6u0c5vsbbjfht59oj3e00ob7ff/raketolutudigele.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbc87a26c---8620600777.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdbe601a2---pujurojupituzewaworo.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec73b0f3e---jetonizafubifenoduval.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c722e8a19fa---54561158931.pdfIn PDF document text
- http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/69411037736.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a55044d614e---wovewanesuwolusi.pdfIn PDF document text
- http://ucinnovation.ru/admin/ckfinder/userfiles/files/29488674841.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/19l9p5mlj59ep308svj4ir9cq7/resutugote.pdfIn PDF document text
- http://vladjurnalist.ru/archive/file/boxuvadijisimi.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3607ab131---85859652589.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bff4010bb0716d11633266ddc2ea8fca/77785243834.pdfIn PDF document text
- http://fygl.net/uploads/file/220841261440.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd126d75c7---4667713895.pdfIn PDF document text
- http://cbcom.eu/ressource/site-image/files/vetopapetiru.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2e4daf0156de07aa84ea38e454864848/28891936432.pdfIn PDF document text
- http://fitviewer.biz/files/file/wesisotinobumijovif.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/goi40u26nbjh3bjqf0fjjk2vna/misomus.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450cfd85b9---kebafu.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c82040d5e---bufabovegi.pdfIn PDF document text
- http://tsg-edinstvo.ru/userfiles/file/30163260995.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609215a1c2a91---32515220628.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/wojawana.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_off0000f464.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF464	16700 bytes
SHA-256: `bd1cea7acdf09ce1acb2b64a19b16821f484084d5cbd53ff33cff688ff445974`
`font_01_sfnt_off00011f51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013768.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13768	10124 bytes
SHA-256: `70c17bb5fc2f755b89763c6bf17fac84a540fa7b1f454dda7765d15507a953b1`

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