PDF malware analysis — malicious · c5d8f897c27abe82

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 12:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e723a554c2c6b3b97de307fde93b6f12 SHA-1: 3978aca44d703bb08c963096adb519dbc5c16797 SHA-256: c5d8f897c27abe8283d877b9800754ac1487abdda506ed06d086eab57e3bdb8e

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, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URI links and link farms indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=download+billing+rate+inkindo+2018+pdf PDF link annotation
- http://edu-family72.ru/content/images/uploads/file/7154322916.pdfIn PDF document text
- http://titadoorbinhduong.com/upload/files/75358512570.pdfIn PDF document text
- https://airflow-skateboards.com/userfiles/files/60612771282.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0515ea19---wibarekenozoroxatidimudaf.pdfIn PDF document text
- https://zlatartopalovic.rs//files/xunod.pdfIn PDF document text
- http://thephinhmienbac.com/upload/files/jewowolud.pdfIn PDF document text
- https://gloriouz.in/ckfinder/userfiles/files/mapipowegew.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c4da486a289b5c357948a6b5a5661e8/donomulobetuxarovesuvujok.pdfIn PDF document text
- https://xn--80ag1a2a.xn--p1ai/files/file/fobibexivakozudikegubo.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2cb13fce0294878eb6cf25f3433694ad/35928140.pdfIn PDF document text
- https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/82b00e1de04d7dbfd9b265154894a0ca/40949639544.pdfIn PDF document text
- http://bogelaipigeon.com/upload/file/xuwebopupori.pdfIn PDF document text
- https://activsport.ro/userfiles/file/46884920247.pdfIn PDF document text
- http://uzks.hr/upload/datoteke/vupatajeturok.pdfIn PDF document text
- https://vegas-shop.net/uploads/files/45241769070.pdfIn PDF document text
- http://napiarsaigh.com/images/20472798693.pdfIn PDF document text
- http://chinasoftcore.com/userfiles/file///65564741386.pdfIn PDF document text
- https://nergizleryapi.com/image/files/zazuzevora.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/2970300204.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/983c79907dbe620c5efddc42f13f45da/17895403682.pdfIn PDF document text
- http://abwingstop.com/uploads/files/22693479589.pdfIn PDF document text
- http://www.jokilaaksonratsastajat.fi/file/69510566607.pdfIn PDF document text
- http://findmecakes.com/userfiles/files/74409891629.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae331cccc10---wawerazetex.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160830d7d54439---86104124214.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_off0000c6a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6A2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000deb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEB4	15876 bytes
SHA-256: `134fff69c9e51b644e6148c01540492711468b7de639d98c112d96a80f30a1e6`
`font_02_sfnt_off000107b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107B6	11328 bytes
SHA-256: `3b49bceafb88e23f03920ff557ea7417f049e335610e0bf44e51476653b98da9`

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