Malicious PDF — malware analysis report

Static analysis result for SHA-256 43da7ebad5f31c00…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 20:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c85377f60e903fa6aa157d4d9a5b77a4 SHA-1: 79fc60ba0a2548dc5d59e8061d16ea6dc670f65d SHA-256: 43da7ebad5f31c00db5be2de50668ea6dbcc46702d05cad6f6b8b32fc273aca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=erving+goffman+frame+analysis+pdf PDF link annotation
    • http://go-pxl.com/uploads/files/duwobunuvoxogazeperuwaw.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/1372802308.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c1965a0b---606868999.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ar774llv1acdab35303dununk0/misozivipefof.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/271ba166d6731a17ab96dd1b5abd910d/gimov.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xokudituk.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06dd75e64---minona.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/kamosuzesigonokog.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1fa225763736471fd1769be7a763ffb7/47958039520.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7494faeb---81107105077.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/pozivabitesij.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/71461469021.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/nisevuvovegosijixi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b40l7p5s2v845kir2930iudte5/26114531325.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/lezon.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h439cqqvvf5gtgut3b2ltvo940/bagorapirapufawik.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118213dcf2b3---56917360568.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/05b78b3f246069890f05ba7eee4ae7e0/66166507539.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210707_A1056FCC471FD8A6.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bd9fdedcbdd6c3ee29ebb293ee802905/39416104721.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f5036098---jajutotopowivatu.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/145793766060dea92573ed7.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7bf7a4917349b4dff8b18b73dacc5608/94058760704.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/41573530118.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 10908 bytes
SHA-256: f373f6eafad9f3ff57f506c84b4b258f4ac5c8f241e270a48a28e3c57e0f68d2
font_02_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 17084 bytes
SHA-256: 9fd8ff85f7d2ea2c3c4de10df7b164db782b99724fbee0886a524bc1d4449a53

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