PDF malware analysis — malicious · 988bf2e349b47573

MALICIOUS

PDF

93.9 KB Created: 2021-07-07 12:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d516e7802a118d2adcb151a5f4987769 SHA-1: 39aea310916ab8122a18af854fee11f1726c89bb SHA-256: 988bf2e349b47573e249bdeacaf38e2ce469c822389196bd81e4b8ef15e07c33

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

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://drafthe.ru/uplcv?utm_term=a+tiger+for+malgudi+questions+and+answers PDF link annotation
- https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d20b0b0d71746b4c1ea0c0682ff9c6be/moxuda.pdfIn PDF document text
- https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ueiaqt0q62n9r96geuoodtmtt0/mepufumigij.pdfIn PDF document text
- http://kajsanordstrom.com/userfiles/files/nepekuniwux.pdfIn PDF document text
- http://casier-a-bouteilles.fr/file/2871726257.pdfIn PDF document text
- http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/xaxikekunivifufar.pdfIn PDF document text
- http://www.ecostroyservis.ru/File/8345977237.pdfIn PDF document text
- https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/d6814cfed254bda4ac0f8ab024c5cc06/bekelujutupexokosibutova.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd723785b---29740130161.pdfIn PDF document text
- http://www.kickcommerce.com/userfiles/file/17690411146.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/30783103909.pdfIn PDF document text
- https://mobiligennari.com/userfiles/file/35846609597.pdfIn PDF document text
- http://tencanpowder.com/d/files/54914144747.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/21be2dcdab51f2b13382e6d997304385/72672212286.pdfIn PDF document text
- https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea14e49a940afcd7a305250d54a01c97/79065286258.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/506e26c678073190eddc9ec79c3240ec/40733622906.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/4dace926c4085e072cfeb1063cd582b7/pobibafen.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c834359393---59881524250.pdfIn PDF document text
- http://esenkardeslerinsaat.com/resimlerfiles/68362625981.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/241c12bb035f22d0209c2be03e815878/82173245701.pdfIn PDF document text
- http://vitanova-cattery.com/upload/file/sebofibabisifopomulagofe.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ab2d75ab82dc0427678b23b62630f7c8/rifig.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d98e53adc---49339304791.pdfIn PDF document text
- http://clubesquilacoma.com/uploads/files/masivizesofuni.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/797faf935892391a38204c92f6d99daf/mojamazowubesatelageruba.pdfIn PDF document text
- http://atut-biuro.com/uploaded/file/72393172270.pdfIn PDF document text
- http://jkmdc.com/aversystem.com/userfiles/file/8440391135.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_off00010ae2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AE2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000122f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122F9	11008 bytes
SHA-256: `69ee61848a61fed61f4db861178d7d99245ad5cbd6d4ef4b68659b024d109422`
`font_02_sfnt_off00013c18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C18	17612 bytes
SHA-256: `a5b0d236602fa8db275c24a50ff0f5ac9ca1bcb5a5561a49c25890dc6e1600de`

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