Malicious PDF — malware analysis report

Static analysis result for SHA-256 0946db0dd3c9e765…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 18:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6eac8efb4f501ad4ede193cbf45f3795 SHA-1: cbe96297e66296ca1b9fed0a3360f52483ee088e SHA-256: 0946db0dd3c9e765d566693524dfa3afe03ab60148ac5f25d08958f13c1d2afa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e9e9bb4462e0596a80e382c9c96e6e5b/8636987229.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82c03e325---kuteduvabulomivanapawu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bc0433b9---buguxoximadumubaturapozef.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/61034507013.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/11j1pb9hfdo17qd14jp8aq4nq3/69385810810.pdfIn PDF document text
    • http://mcutech.net/files/pojanunuramobotanuru.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/19983288299.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2e191a44d---wefikogafo.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/5759519551.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16075c162799ac---tevopepofo.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/36617145224.pdfIn PDF document text
    • http://askort.pl/Upload/file/7026486631.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c9682a74415b629ee3891d63bdfee616/19398391061.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/348eerbj49dtgnvi7r2e9qoha8/xekejawatujirag.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0342e1a5b5---toremixobefoleg.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/poxaxagilipakaso.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d28b11d04c---kasivenodoxadikuwinaj.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/98663778299.pdfIn PDF document text
    • https://hotelcorona.ro/files/30504515492.pdfIn PDF document text
    • https://areicon.com/images/file/14796614391.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4aa32af6a175704c07bd0aef250480f9/39534046008.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0930d25cb3d6c51614eed1247e578d32/11994694401.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/14d246b28a55d969060e153d09fa8899/31511689088.pdfIn PDF document text
    • http://master-vin.ru/files/file/90048964880.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/xubogabotonaziz.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caaac38232---renud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lenguas+indigenas+del+peru+pdfPDF 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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 10512 bytes
SHA-256: 31bfb6bbd78e4786405ac3e18e380a7ef7387b3831341bb585e6f9bc03e57d2f
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 17428 bytes
SHA-256: 25a9ee8f40511006bf72c5aae341776730b405a420e40535196d17fc45c0c6b2
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1