PDF malware analysis — malicious · 281ef17ffadee65a

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 0f2c863a1b4e3f01d8451aff2b5de457 SHA-1: 7431c1b1fd86fc19a836cdb69f7e4b3805b77df9 SHA-256: 281ef17ffadee65a24550d8f3d4e58bb123ce1b3e1f2404f6eaa67227fa3350d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious content, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=oops+concepts+interview+questions+for+experienced PDF link annotation
- https://marmarases.com/upload/ckfinder/files/3503580490.pdfIn PDF document text
- https://sheenabusesandcoaches.com/userfiles/file/vufobulikipalewonutulu.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c813a4413c---32377690080.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/aca74f3f30edbb92267040264af3f97f/toveruzirinojumefodik.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722330810bb---pogiborawitufodu.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683c9ecdeb---30146447475.pdfIn PDF document text
- http://thaide.org/userfiles/file/tedudulizosuju.pdfIn PDF document text
- http://josephlillianmorrisfamily.com/clients/59960/File/35850060389.pdfIn PDF document text
- https://bancodevida.com/bancodevida/admin/images/image/file/6545207659.pdfIn PDF document text
- http://goldenpeak.it./userfiles/files/tajikekunogerazagexasa.pdfIn PDF document text
- http://wsp.pl/userfiles/file/mopenepelup.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8019982c6e---42057998364.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fa0004bd44552c478dfce56a95236036/2451285772.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6f0cb971a---21574055360.pdfIn PDF document text
- https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/rv8ou9o0defa571607qph502lb/xedib.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/cbb0ad9729dd34e9a871cee2468ee000/wurokojasixiwezadofak.pdfIn PDF document text
- https://aspaeng.com/files/image/files/zadeluromesifitesabopuv.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160873b847971b---36634922033.pdfIn PDF document text
- http://tlxzkj.com/uploads/file/081512218639.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhc2evmchm97epqforcgln19o5/14855276028.pdfIn PDF document text
- https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/uj46ilp5okiv0tc5ho3mfghbsf/18241299026.pdfIn PDF document text
- http://abwingssuffolk2.com/uploads/files/76437088878.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210501195051.pdfIn PDF document text
- https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg2v76m7q0tgf2hv1rq9b751v4/47472640456.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/c0jgdo8ph2h4nfa6pip8256gj7/mexotete.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/20a7b74c8dc115f20286fb877623949a/99275585201.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_off0000f5f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5F3	16780 bytes
SHA-256: `8fdca0ea0a47ec0264332ebc2748a2ea7062e2aec1e35abceb962d495d421bd9`
`font_01_sfnt_off000120ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120EA	10928 bytes
SHA-256: `06195953f8439460e46dc58964703e99ea41b74c4544ef126f69419fbe697fe4`
`font_02_sfnt_off00013a43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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