Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bef7418f298de3…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 16:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67690dd2489c5a8437a3b2c98a347294 SHA-1: f2f20de3341cdcab763aa95c8e52bf4a6a17f04f SHA-256: 09bef7418f298de3e06b4515bc16edda8d28fe9e7d7591db610417ca625cf2c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cabsfromheathrow.com/userfiles/file/54685983644.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/biruvejixokuriso.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/gilazosamu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608682ab483bc---valojebuxo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c15bf85949417902a84eb7f4c3eb4657/wawilakuridoduxazilefofut.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f4a6646ec57b4a617cac8b08f7ff621/38204324775.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2202166c---88413135956.pdfIn PDF document text
    • https://citytrafik.nu/images/file/64341626922.pdfIn PDF document text
    • http://agrion.org/upload/fichier/99782762666.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092472adbf9e---xoxowufosifirukek.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kumibudomulemibega.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a2b067cc---9957105222.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pafikejameponemuvepasa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607001a8a4249---26963463522.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/63828124401.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/zuvukimowuzunexosafuwinos.pdfIn PDF document text
    • http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/95988108424.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/57655648665.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/84358848433.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/1040735619.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vitakegisudusuxesu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fd70debfd---balapejojupivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=svs+sb16+ultra+manualPDF link annotation
    • 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_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 18628 bytes
SHA-256: 2d378eee43d5d16eb632ef5b4393c16241779995db6771ad69eaf255c6e7f2a0
font_02_sfnt_off00013c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 10524 bytes
SHA-256: ab36a866c4b250c370910043bcfa6f032d200ad1022cb736b5450aba86c619ba

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