PDF malware analysis — malicious · 161c4b2bde249e92

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 06:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a33cc3b35913fc93eb65fb7f81936574 SHA-1: 484937486c5d288b8f458d05d59e22e4ef2d1ccb SHA-256: 161c4b2bde249e92fd11af9ccd4da6b29709f36addf93d306527f7c2d59ea9d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially track user engagement with phishing lures.

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://cructi.ru/uplcv?utm_term=treatment+for+sense+of+smell+loss PDF link annotation
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16095c54942d8c---digiregotiwabas.pdfIn PDF document text
- http://austria-ex.com/images/blog//file/fifedilafofezabebugixepi.pdfIn PDF document text
- https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/23249964e160a6686a0d5ec4c60311ba/86245247612.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/13426239389.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/eb9dff69695c6c02a93a14e8c1b53060/55626311261.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/422cd1e436d7a4d27417fb0ddfc18d49/rosakikoradilujarebufeb.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cc2e26af---pabifidiwoboxepelesuje.pdfIn PDF document text
- http://atek-ent.com/upload/file/90494435004.pdfIn PDF document text
- http://dokumsuzgec.com/userfiles/files/37372874335.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef26cf127adc0b6bfdcc8c09aa9648a8/bejira.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963fa9a7276---vibunuxoxo.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57e729d3f---12124380111.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a05a0adf---xoruvelopoj.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f5708375---palutorew.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b11abe06c490f130733f5d9561236446/jagatikivulilufokajobiwe.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3a597923---xutojoworu.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b625931b5---7912352782.pdfIn PDF document text
- http://sixtyguildersresearch.com/admin/photos/file/67179449326.pdfIn PDF document text
- https://my-natural-style.net/upload/files/gakukogebavaputisadi.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/7374288446.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/35296724441.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c79aac69fc91eb43ade7b0781e93a4d6/dofegexuzevorevawaradot.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/sikitedewa.pdfIn PDF document text
- http://chouchoudauphongongtay.com/upload/ck/files/vitotowapasilawuka.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/mezujamomojagomak.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_off0000f420.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF420	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C37	10244 bytes
SHA-256: `93def4905c0323734439cd6142ad5185cdcb533f34fba6e00df7468ea1ffbf79`
`font_02_sfnt_off0001233b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1233B	17232 bytes
SHA-256: `ed4925a85e440ac568c31e052f54395370902adba79f94b4a3ce4b86abf88ef7`

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