Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f74e663257553b8…

MALICIOUS

PDF

80.3 KB Created: 2021-08-10 13:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6349c6a882c986ea48f4f1f03a932512 SHA-1: efbe829e4326bc7ba32527d485336c60807bf7b5 SHA-256: 4f74e663257553b88cad705a5ad45d12d41d15fab168d6cb97d456dc101d3ddf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nomylo.ru/uplcv?utm_term=porsche+macan+2019+for+sale PDF link annotation
    • http://veterinariogiardinelli.it/userfiles/files/20189163473.pdfIn PDF document text
    • http://elm3rad.comfile/44167702930.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/29246432950.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d47003d7---80521451984.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fc9cf5f5---95814196617.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9m88s84agjoa5nap1ts1bb92o/51330239162.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/83278924955.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cd9a7bd2bad6ed73fa5b2483f163fbcc/pisuzozijurododinu.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/26611851193.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ff44a2e1---89813697904.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/tikokemixodoxuso.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/mifebof.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db187e4cc0---penajapuxison.pdfIn PDF document text
    • http://df-foundry.net/d/files/6752264566.pdfIn PDF document text
    • http://imi.vc/upload/files/bexilarus.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/661f5641de2da2092b00b547e4ed3004/zopudalulovapakun.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/fdcdb36cd6bc7a982652039adf4c3f46/53052786593.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jdtmqe2plm46ss28585rsnble2/fewosiwurov.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa670618150---39299681238.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tujudefeselubud.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/94827495725.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/77790858336.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/35804446100.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 10876 bytes
SHA-256: e8801b22fe9830c56edb55cc41d3371caa3ae737898644eb8e14bd3a5f062ff4
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16980 bytes
SHA-256: df552df2e99355585ab45883ecc51eb467701465041ee2568630a112d0f78fc6
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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