Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5754db07428a13c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 16:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9059301c678c63fd06e2660f3b2d262a SHA-1: 5e0aa5e59f82d07826237e5740f0263c6a1bcc4f SHA-256: a5754db07428a13c8125b262d08feebcd29d2a0c9a09dece3d6a580388137e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the link farm indicate an attempt to distribute malicious content or conduct phishing operations.

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=playing+android+apps+on+pc PDF link annotation
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210901061003.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/30567353994.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/vowesudowujekug.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tevoloruguzavosepogawofe.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/sabinemupadevivi.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/12900199318.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/sarokokelozok.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/kekeb.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/pibavakipimisefurat.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/34564170436.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/33cf2ece8ea7ca9725cf0a3b9262e008/xifugitikabogawuda.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/pofisibunulogufirababidef.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/43392582019.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/bezuxo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/13460215106.pdfIn PDF document text
    • http://btfa.tw/upload/files/vikoxaji.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gufib.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090910213250.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/57703982099.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/benezikopinisif.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b417ce4a5fa92fab8170b0d798d23603/wevilenoluvesab.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb00f0b202---mubibamo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed5dbf87e---40450383241.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82734432424.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/63574719445.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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16932 bytes
SHA-256: 64d41701c20e1b0c7b64704a003226ec3cd7cdeed302fb98737962e3979c5cc6
font_01_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 10572 bytes
SHA-256: 49aff51923c614bc93aaa4fcbf6667a0edf3a930c0b84bd698dbb6b190290e82
font_02_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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