Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a7d0b7476e47a8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 09:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2a21cc94d250f0e4f87cf908728bd79 SHA-1: 759981a73ff3a15231f8855aa6aa720c9f94dd81 SHA-256: 13a7d0b7476e47a809788bb48866b824c51b3726475e3c23ee64e52d0b6b6384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=downloader+on+fire+tablet PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7q72gj0h9ue1p07cjf2avhg715/pomakamerupatuwo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bba05bfa---8740606324.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/gewelo.pdfIn PDF document text
    • http://congtyvima.com/images/Download/64676729252.pdfIn PDF document text
    • https://fratellifurloni.it/file/zasomunekodogusizepeko.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d3791ac2b---rakoxiro.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b6d6b324---fadoganuduvu.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210902222630.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/bebezilobidozow.pdfIn PDF document text
    • http://speckrepej.com/upload/file/57442752867.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/lapixax.pdfIn PDF document text
    • https://gangnampools.com/contents/files/zirazigufeburusagateba.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/puxemanawox.pdfIn PDF document text
    • http://servmed.net/userfiles/file/liluxegom.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d9e4a081726c7090cf1d07115f697d40/wozinudeja.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/19105617283.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zipow.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/26185483403.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bituwuzikokusexuxiluxu.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/16358818434.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/38024713531.pdfIn PDF document text
    • http://abworder.com/uploads/files/pidep.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/20392743652.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d885e8621---lesupox.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16472 bytes
SHA-256: 76029ac3dd6a11f7581babdb5925d184e9b2f9cd67b4530377a49c1f7a7554d3
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 10404 bytes
SHA-256: f1ed7ec4225e1279d30a10710bc1cc04c71dacc3542b518effa8d367c2759d4b

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