Malicious PDF — malware analysis report

Static analysis result for SHA-256 360965b702a8f261…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 14:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84953897c3d2e19a07771b6ff318b989 SHA-1: ec5ad33d70113aa65395693128e4313e65c38640 SHA-256: 360965b702a8f2616f69b758c03236fc7bc7cbda0f2d4ea0f2bcb1e94cdad4a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or scam-related lure, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=quicksell+premium+mod+apk PDF link annotation
    • https://stvorki.ru/files/file/16144195550.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/nidovuwevenikerafotipok.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/45493150087.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zitefujete.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/bixuzi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f53477d---91100600692.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17777050223.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/50293887151.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/wimipew.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/pajufubek.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a95e291a97751688f110c9843d671bd8/90625981212.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/16378276532.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf56ec00d---55699172304.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109090836129229.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/36521455283.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/lexifizujupi.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210913_103413.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/53317892592.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/49749686812.pdfIn PDF document text
    • https://etadelloro.it/images/file/14009647423.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/58012551270.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/26712061049.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://tunglamgarden.com/images/fck/file/7755055588.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde4be4a26---jedudetanokivaxizuzadide.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6105489da5127dfe3b48b98ccf2b0940/vawawoko.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_off0000c361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 10724 bytes
SHA-256: d0dfac676e9a5f6b07c94159ab467bceba638242525b5f21794a0d192621b4de
font_01_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 18120 bytes
SHA-256: 229af0665193d15b19e80be39db85d3b33067da7510de146b427301f346448a0

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