Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61ced009d9add6b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 15:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d0ce57d8f9f2d59323ee96688e488d2 SHA-1: 1a61619a9a136b9f5aaf54e831a2b6e612f59d29 SHA-256: b61ced009d9add6b17be596e683a5a1d9c59d921b5f312ba5f0c0a205b9a9675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://armanetti.com/images/82353369868.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a53f5bec9---timazuriwivajularaxuxu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa34f0174---kaguw.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/81317487433.pdfIn PDF document text
    • https://anup.bo/images/files/87877120886.pdfIn PDF document text
    • http://hueide.com/upload/files/kokitib.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zamidizugawurufiwewinaxe.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/31295484550.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614615010a5e0---9060199143.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/tekamegaxezejarewoko.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/sekujizanavumuzurufozaf.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/22470561788.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/85367662298.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/maxatal.pdfIn PDF document text
    • http://infosierra.es/images/editor/12425877831.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/80760520574.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82070660647.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/xokakawe.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/waxejudukede.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/kilikoxadoxewajugifesup.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/58385642419.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614369354064a---10551919841.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/90349304959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=utorrent+app+androidPDF 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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 18056 bytes
SHA-256: 5cbec6c2062afcc21f6bdbda7e3011e59bb489d159bf6180c3014b14fddc45ba
font_01_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 10180 bytes
SHA-256: 7de17f13ba746c1c072f2d47aa202dba61ad05164aab3de6bed09561415e4a9d
font_02_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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