PDF malware analysis — malicious · 5bd46d331ce5c618

MALICIOUS

PDF

76.0 KB Created: 2021-07-04 19:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 34947d060ab1c930a5c5eab7ae18fb8e SHA-1: 3a74f62078cea9f331f5f048449b948b78f0e4f6 SHA-256: 5bd46d331ce5c61835df98ec77233d89842134320fce511633ef1c7b57ed5b04

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://oniceh.ru/uplcv?utm_term=come+up+with+word PDF link annotation
- http://franzoesischebulldoggen.eu/userfiles/file/95637437444.pdfIn PDF document text
- https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/krrg6nb4bk0jnvs0grr6ph2fg8/nanasube.pdfIn PDF document text
- https://mama-light.net/business_school/uploads/file/20765060527.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608729952bc42---99801703485.pdfIn PDF document text
- http://imi.vc/upload/files/tejazesekefaza.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b5648b94d---1855152745.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608445097d51b---lijawexamonupawep.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/12595842637.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607409c187297---virofefajabesu.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4896e5749cbecd9d4f0e2e975ebc0e45/zajuk.pdfIn PDF document text
- http://geometrabottero.it/userfiles/files/mazuxubivivaxer.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4138f2a2---76092579877.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7ac16ace---96987277818.pdfIn PDF document text
- http://arci-mp.fr/admin/File/82780604362.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4bi8td8fum0iv4obgh5msdk3u1/goviri.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3571f0eb08db7739feb189d106debb24/komugapavosugosokalokoju.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/1655039606.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/74082bd9c579e9143640b2a2a255615e/84273466454.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/1can3pepipvak6u21qbtg6riup/99315862369.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1099b92c63---goremamofijijux.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3372a6649074727473e3dfaddd0a773a/wulopototigog.pdfIn PDF document text
- http://18554080.com/userfiles/file/vofidowadimadanogevi.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32bfc4e8e---61020254932.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7c391177bae3d2be8b945210dbb23e2d/32363333192.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf42ebe61b---gomirexonijapi.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_off0000c6ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6AB	10396 bytes
SHA-256: `f8dddd13c985024c0c2777e70738ccfc60ac163d6d0c96c3c52435ce8906ca73`
`font_01_sfnt_off0000de3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE3D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f64f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF64F	16616 bytes
SHA-256: `391ea2e57603701fa5e7f43f4e5c7d62308efaa82611d49222c6d0e72111ed92`

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