Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab20002cabac67c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 17:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95736bff1430a7961a14f86f57e9b3e8 SHA-1: 3083fc1754caec699b059b062716d98422316806 SHA-256: 3ab20002cabac67c81d22dab4da7d4905efe7e6f75c46d008b622ad7159ee0b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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://irlanc.ru/uplcv?utm_term=hack+android+same+wifi PDF link annotation
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wasididinuder.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/25907700995.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109020726456241.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/17933880317.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/gozoxufafedamixavajiv.pdfIn PDF document text
    • http://lg-palette.com/upload/files/lepubejipat.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210914_5B6BF700947FD2B0.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/46399575472.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/85431947601.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/56045699595.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a1bff50---videtavimupefonevive.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fc14b765---zimemibanejadawel.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/57857884213.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/43783961771.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/rineganabajemogo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/41c9cf43f28f3aaa9f385c37f7d70cfe/lenawejabobavamot.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jibiwif.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cvmd5kq247i9rtmk6fts1st1bl/41159351462.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/84116117741.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/vebudorunofapifose.pdfIn PDF document text
    • http://analhospital.net/file/files/resakorupavatofuvasepo.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/10196445839.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3a72e81f6f05ec1d1c8e0b678ac6b48/31729608464.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/6312434041.pdfIn PDF document text
    • http://pronobile.de/catalog/file/tesezomep.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.

FilenameKindSourceSize
font_00_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 17180 bytes
SHA-256: c8424961aed84336f15f6d78868238904f355562c1658570bf108a2fc2158122
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 10664 bytes
SHA-256: 5bc7a4ac743fb4cef446dafdc4ef559eacef94e294cb8b01a443eed7996acf1c

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