PDF malware analysis — malicious · 6163b7600c9be172

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 18:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: db105600a4aef60a973367449edcc9b7 SHA-1: 6ad7501736081a217eea1cbf7379ad71ac323317 SHA-256: 6163b7600c9be1723c95264b6e712191c05a8b0c15143a9dbcfe28bfceca4ad7

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 document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=jeep+cherokee+2019+manual PDF link annotation
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e710f752e1---xixovofidujivib.pdfIn PDF document text
- https://louvre.lv/res/wysiwyg/file/rududasuvinepebasazoki.pdfIn PDF document text
- https://ncvpte.in/userfiles/file/roduvidosofew.pdfIn PDF document text
- http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/rewetipizopob.pdfIn PDF document text
- http://wahluenfty.com/userfiles/67165041816.pdfIn PDF document text
- http://bortran.com/upload/image/file/20210601062158.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b812caafee9---22922442934.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80721420c---govemuvikugusilegizewexob.pdfIn PDF document text
- http://tomekorea.com/userData/board/file/gebojakowivulorajo.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fc581be8cb9f97b41248cd737c155ebf/fixub.pdfIn PDF document text
- http://centromedicoveterinarioadda.com/userfiles/files/5325535428.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5773850f9e---basepujakig.pdfIn PDF document text
- https://cdmsig2.com/ckfinder/userfiles/files/vaxepuvopen.pdfIn PDF document text
- http://chinalabware.ru/d/files/72994855424.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1c4089e5---denijinupurozov.pdfIn PDF document text
- https://oklogistic.lv/upload/file/firiwadisoda.pdfIn PDF document text
- http://dannguyetltd.com/upload/files/56519938900.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d9f3d0e74b16fec56b3a9479f2097fd/45822563701.pdfIn PDF document text
- https://alrukn.co/userfiles/files/kidesukukobubade.pdfIn PDF document text
- http://longvu.vn/Images_upload/files/51364231977.pdfIn PDF document text
- http://irina-beha.com/ckfinder/userfiles/files/20054154571.pdfIn PDF document text
- http://airfa.it/userfiles/file/80510485699.pdfIn PDF document text
- https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/9441234469.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161145c98a2a17---44325534936.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9e4438ec---56429478692.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/64aea83d70d31214e03949abba1c6a57/mogipebesepawejovulogewev.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_off0000f023.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF023	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001083a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1083A	10924 bytes
SHA-256: `ed52b0184ce0805d763b7060e51d9f256d8d8fbf5c0950e4f2b88b6399ee42fd`
`font_02_sfnt_off00012170.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12170	17416 bytes
SHA-256: `c57b16c43731cbbb28c7a4245b5a59e7f00becf68351f8b89a2a657b99eb284f`

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