PDF malware analysis — malicious · e327bc7a8c2b3da2

MALICIOUS

PDF

84.3 KB Created: 2021-07-06 00:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a823c08a1e26fd71bcda076361937e64 SHA-1: d4d03b790ddd27f6b30b058692411169b1707461 SHA-256: e327bc7a8c2b3da2dfc3a2568fbd919b8ab0522b7168232a6d98fd6ddf439a87

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=pdf+reader+for+xp+free PDF link annotation
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ce5ead07---39914442211.pdfIn PDF document text
- http://box8websites.com/ckfinder/userfiles/files/86294719197.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/pogugofa.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/240mrdvqufv83519oaubeosuij/jesoledot.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6063ae5f---57764531197.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9s0emeoji22be5flbaj0jdhd51/52320965298.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/568jh57ri53lud2v88r3hlu1rn/paxunumumigemajari.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92283e86c---jipigedexowawenemewaf.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f4d06752b5324459a60b0daefeadd114/losibaturinoj.pdfIn PDF document text
- https://benqmusicworkshop.com/fupload/file/81369387075.pdfIn PDF document text
- https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/6829ab4881f867492f067e47b646f095/97959870334.pdfIn PDF document text
- https://dineflon.com//files/gamodovutevelowe.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a31226efb8f---55666746509.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4f186fe5---wakekuvovinisufof.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbdf0c8bd8963a00bb7e43fe7e0542f0/wajoremikinabimalopiviteb.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4477gskpm4g5ntoi2b022kfeeo/24095181961.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2149fbff---82739502655.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/94440359909.pdfIn PDF document text
- http://izumrud38.com/ckfinder/userfiles/files/xadevegumutimofekar.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609488c7e0b1a---lobimumufa.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e09c5bbd8---70665797934.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f49ed43b2---tuxiwoziwedutogifes.pdfIn PDF document text
- http://iphysiology.ru/upload/repozalegutijosiwi.pdfIn PDF document text
- http://elturo.ru/img/upload/files/65037648577.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_off0000e93b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE93B	10084 bytes
SHA-256: `a81d2a4e62c3ebc0d1938f084700e3f6e11e766c92d0c95b5fc465085b36ef7c`
`font_01_sfnt_off0000ffca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFCA	16536 bytes
SHA-256: `513b3f177915a5a5b3e9b33fe1c9559b6c1bd9bd93852b733e211fd3675d00c4`
`font_02_sfnt_off00012a9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A9F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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