PDF malware analysis — malicious · 5f1d13600abf0e28

MALICIOUS

PDF

79.2 KB Created: 2021-07-02 11:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 440951c78df032b29c614d961484d6a7 SHA-1: 8ef2a931b152d8a742323a157225e31df86b0f74 SHA-256: 5f1d13600abf0e287daf137eba2da3af1648562e4a4443b49840b20dbf35343e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=large+duodenal+ulcer PDF link annotation
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced16bc452---datulasoniwabebimebil.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/v244eo7udqi3m9215qjgar3lhk/xikirezitejutuzivokado.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed6f55500---50811159603.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f6d91915---10089724247.pdfIn PDF document text
- https://vandolderskb.com/images/usr/faguwuduseg.pdfIn PDF document text
- https://adsbudget.net/userfiles/file/mopivawozuzav.pdfIn PDF document text
- http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f451281833---38450110561.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4ee399d8d0e09d817ad93f0c686baa0f/8771796531.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090a33c924a0---12043036677.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b94cc2cd5---4907072216.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0a800188410ed4295d09a152fcaf1fcd/rorupupumevepoxovix.pdfIn PDF document text
- https://carparts-fixture.com/file/file/nabiwivatofekamibegipoziv.pdfIn PDF document text
- http://derkwoo.com/upload/editor/files/2198052913.pdfIn PDF document text
- https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/857ace76d89c08df0fa303f528bad149/jufegitorarewe.pdfIn PDF document text
- http://mulroyenvironmental.ie/userfiles/file/25784514816.pdfIn PDF document text
- http://guowangcable.com/d/files/tebipivexajulidojireba.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/49835509804.pdfIn PDF document text
- http://anupbolivia.com/images/files/jexewolujok.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91902e8bc---wukofejepomuzufigesil.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ed2f2dfd---lekimuk.pdfIn PDF document text
- http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisoluvaduzutik.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nj5q2ofpdm0fv33d4nmvbmfpu4/99228928523.pdfIn PDF document text
- https://hanahana.vn/media/ftp/file/60187223970.pdfIn PDF document text
- https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904db8e62ae---pogasuzuzobijovaf.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/640b3a97291d9effb2c4a1612ec4b4f9/sijor.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/00c4c5141f045c9384cc197721027439/kekitotakitezikulagele.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_off0000d5b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000edc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC3	16040 bytes
SHA-256: `912642f4ff4cd3af120e43e8a39ee54936ff8e0e9be3bae6695aefc7b8e9d10f`
`font_02_sfnt_off00011738.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11738	10244 bytes
SHA-256: `573fcbe1e69de50ac89e9c789ed975ecb1525560c0297ae25d806a09ac0ab419`

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