PDF malware analysis — malicious · a2f4ed09286b8fb0

MALICIOUS

PDF

91.5 KB Created: 2021-08-07 14:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f8b185b1329dc6c212c0e53b9c11b6fa SHA-1: 1065b659cf91a80c925dfa295b465702ef5861cf SHA-256: a2f4ed09286b8fb01b11cfb9163d21a600d0d40d89068d774facb50db8c95015

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=how+to+find+surface+area+of+a+right+angle+triangular+prism PDF link annotation
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085498a8b942---11040056159.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f37f5582b5---guwijabavo.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fdd77bcd9---88486085709.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/sumavetetesenupibun.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f199f88ec1---gagidufevowip.pdfIn PDF document text
- https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb67742793---vidodavux.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/pitejogikesisuvodu.pdfIn PDF document text
- https://hogies.com/includes/template/uploads/file/87762560877.pdfIn PDF document text
- http://prvugkh.ru/uploads/files/42369713116.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ddce8184---93552151731.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e0f14178---28454562966.pdfIn PDF document text
- http://innotack.com/userfiles/files/30125965114.pdfIn PDF document text
- https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/zugaxizupo.pdfIn PDF document text
- http://triatlonbizuterie.cz/sites/default/files/file/rexejumudowazutiwikofijez.pdfIn PDF document text
- https://freebcard.com/ckfinder/userfiles/files/batos.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607970530898f---58943284815.pdfIn PDF document text
- http://bayanairag.com/uploads/userfiles/files/45472129030.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d9d4d1ae73315a185c4baca462134bf/44171769533.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f8f324e83a08a29e1931b296750bce50/96980110792.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4311590132---vadejomojoponizatemifedum.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e41910822bb---15180152254.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1827f15908---43871784879.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/wisex.pdfIn PDF document text
- http://arcstema.com/userfiles/files/dovarobiximiwepoputorob.pdfIn PDF document text
- http://tatishev.ru/admin/ckfinder/userfiles/files/6627062865.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_off0000fffc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001180e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1180E	17228 bytes
SHA-256: `ce432deea7d4b9dcbac0305a54bb19629b6e0112499cc5099cf67b8dfa879078`
`font_02_sfnt_off0001454b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1454B	11244 bytes
SHA-256: `fa753091c2144285b9ce143706584a0a91ed0b7097b61c17b454c820c38d8a1b`

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