PDF malware analysis — malicious · 22989cabb23935f3

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 12:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4c7b3f042c66a56f2e81b483b0f3d2cc SHA-1: 8aef8bbbed11bf9a4de8ea5c6ecd0f9ae6b7bbd0 SHA-256: 22989cabb23935f3d96fd9d4c2ae6612ff40207eb9db2102c6b696fea2b6e327

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=dsm+5+pdf+bipolar PDF link annotation
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c67a87e58517ceadc5287a3a2824df8f/49028572662.pdfIn PDF document text
- https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0dfa1136---15575254381.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94aa035a---viluxelipin.pdfIn PDF document text
- https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f517ef2c0---vavodatumolodujawov.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba378c90eba---14111858211.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b162f15506bcb1741d852b7f4a06a9f3/99027960095.pdfIn PDF document text
- http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/xudulawulemoj.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a448ad35bf3fe41279c100b17c325f72/55761069395.pdfIn PDF document text
- http://fygl.net/uploads/file/03125442984.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2730a9930e592d974bef800ff4a966c9/1667080573.pdfIn PDF document text
- https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ea998469d---89943661029.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607decea45ef6---dujerakidafun.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ed95cf9372bfa786702dca4c836bd12a/90923099442.pdfIn PDF document text
- http://dyglas.com/userData/board/file/72502133221.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe73934e6b---tijaxopefozavuxunigidigak.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c307f04bc51---49457415181.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/euuod0961emh4ieadmukdtjr3u/dakeritegovifaforezasuja.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6a2bac608febcca508edb1936677d3a/vuxobugoxuk.pdfIn PDF document text
- http://clarksville.net/wysiwygfiles/file/43168716093.pdfIn PDF document text
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16083f19027d74---44336024991.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b094f4e661---70199895243.pdfIn PDF document text
- http://backkwang.com/userData/board/file/21214231009.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8326ecbfd366ad32795e24df80509f7f/garagejufasux.pdfIn PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/93783536282.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_off0000ebef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBEF	10600 bytes
SHA-256: `68463c4084d979ed9a8e29a09d90bc1364682342e0fbf719a598f0fa0c458b12`
`font_01_sfnt_off000103db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011bed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BED	16912 bytes
SHA-256: `042d3c6064ddb9854212f887930525543625d2eb8b60ca037a3675627cf7a832`

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