Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7fb450875126b9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 14:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1ee841affe464d833765d7aa2a3bcb7 SHA-1: 7b9544476021bf105f1e805d76aee6c49d4fbccd SHA-256: ba7fb450875126b99e0b25dd91e974f7a50248e7253bb3f67a22ae80b6671f81
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of a 'download' button lure further suggests an attempt to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=747+papercraft+download+pdf PDF link annotation
    • http://articolo17.it/siti//usr/foto/files/bobakanovoxopasazew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b53d734a9---51763031624.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/2127040820.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ec8f034a6657d2ed77c316535835e704/zedadirapenugeloso.pdfIn PDF document text
    • http://newo.ru/files/files/rikafuvukesufaduv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c047ec329c6---guwituwadafukejenujevuwod.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/31847866496.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/josalekatuj.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/4931815401.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5edbf35e473b22587d5905416477c490/ketawine.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/wakuwofegeluvodokov.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d85369f2a5---78340187934.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ee150620---bepej.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8ea748f5---mupitudevabivixen.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/geguzovot.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/87660334469.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/009a6ff899032ea960ac4d521b80e550/78932970952.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/66770615970.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4142b62e9bb156155e5f254e162e0542/fuboj.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/44431773190.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4336b769---ropijanunerok.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vddlgnnesjonqcmjsg49djmvtn/wumatiretijuxug.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_off0000bf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8D 16652 bytes
SHA-256: 5e281c255dabd3a2b532bedf6383574e2f8d4ef4047c7cda5f1fc6bf80e62037
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 10472 bytes
SHA-256: dbce3fb45b6794fbe682db0f2035bd4d3e8cec7576455e96119a1801babb5536
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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