Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cc9503ea6f676e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 19:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 143a425861709f21b363aee7ac7e0dad SHA-1: e6eaedc0a6bd9b1d6390e5e4b04da5bc5225d5ab SHA-256: b4cc9503ea6f676e97524ce793d64eb6bc54fe86845e13c52de4a3b79c594c38
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. The document body, though heavily obfuscated, combined with heuristics like 'SE_CALLBACK_LURE' and numerous embedded URLs pointing to compromised CMS uploads, strongly suggests an attempt to trick the user into initiating a phone call. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1ed57664---51236897878.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075880d9a39e---32130631992.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xufekegajodanukodike.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/87623056463.pdfIn PDF document text
    • http://alkanboya.com/files/file///zekugazotofile.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/gilijenipufavegefavuk.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffaf495e66---41643831488.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902eb774fa1---lowikekifawitipiw.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/72910758296.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8597033166---46410080784.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ci62fa24ei0s1smksj0h65ao85/2070944979.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/74dc95e32a4441508192aad9cdf7d31e/49485930669.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/r7uvtavm19049ci2bjdgfghu2d/tagaxukujukawaluj.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bemimukumodanagabozizu.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/daveragabi.pdfIn PDF document text
    • http://ping-property.com/user_img/files/gemerozozakebawodupuk.pdfIn PDF document text
    • http://coumert.com/images/file/jiganiforakipevanef.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/retipupunamigaxulavufede.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/ketuxowopadililupa.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/wufekanex.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f149e2ab6bb---lupuvipudab.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6db72c6e0---82138272687.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/zukifasetubobiwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=call+sedgwick+county+jailPDF 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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 18160 bytes
SHA-256: 78801060573c39458ae97c1a16ce5d2f59462c97020b183e6677136583e92283
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 10996 bytes
SHA-256: 2304198179884fd1d29eb99f6caf0e430d49d483e0509a283f25bc8b87380b4f

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