PDF malware analysis — malicious · 3eb2a024ddcc8595

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 00:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 2cecf2b4886ea3044f19e59c1bc222bd SHA-1: 344cb09666daf15c85b0421399fcc2fd626b2920 SHA-256: 3eb2a024ddcc859539776c4d9b295400ee301d18376336fb597d2977417b3d88

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9886

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://medvor.ru/uplcv?utm_term=morning+motivational+thoughts PDF link annotation
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5a97c212a36fb4faa39130930aa8e8f1/29739863699.pdfIn PDF document text
- https://thehero88vip.com/ckfinder/images_store/files/76223512895.pdfIn PDF document text
- http://yalciniskele.com/imgup/file/jogegajel.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/bekuvavilinifuxilafinoje.pdfIn PDF document text
- http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/kigatisig.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc29211958c---kejulovi.pdfIn PDF document text
- https://onhimalayas.com/ckfinder/userfiles/files/xonetik.pdfIn PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/jijevadalal.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2301fecd82b3a118c17357106b35c977/lexizonedijoruguf.pdfIn PDF document text
- http://regmac.net/userfiles/files/72940954309.pdfIn PDF document text
- http://www.web-globus.de/ckfinder/userfiles/files/36023759690.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a6c3b6a---3405605210.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e5d7382a---wanuvo.pdfIn PDF document text
- http://goldenpeak.it/userfiles/files/kupazufemeneporuguxajunoz.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7eb662b3---xodinugobazade.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d5309f9024629dddbbfb96f69b245099/29608653863.pdfIn PDF document text
- https://big-affaires.com/img/pics/files/59582701617.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f74ec3eb---zofejadufubeziwotazotu.pdfIn PDF document text
- https://poolpoint.be/uploads/file/nuzok.pdfIn PDF document text
- http://yer-krasnodar.ru/ckfinder/userfiles/files/68810912708.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9d49759ff262a49cf98702d3f7f266f2/42816259612.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612781be65979---47597805704.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a011f4eecd9---2790083690.pdfIn PDF document text
- http://abwlanham.com/uploads/files/jebikowivibaru.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/woxawabodaka.pdfIn PDF document text
- https://vnsteeldetailing.com/UserFiles/files/19753664045.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_off0000f5c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5C6	10584 bytes
SHA-256: `ed42b42ee6041dc2178ad9003e514b7d865bd87a29ba3516c6f7fcedbb05f8b8`
`font_01_sfnt_off00010dc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000125d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125D4	17980 bytes
SHA-256: `2c71e56ec0e646727773430a395d30f5fd577bfa17558dd98bfab9c0faa9ce2c`

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