Malicious PDF — malware analysis report

Static analysis result for SHA-256 4077417e51c5b6f0…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 15:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 15b342818a71f7f2ac8fa85970e9f7ab SHA-1: 48ff9640909b5d2997f7eea5845d11e69bea554b SHA-256: 4077417e51c5b6f05bf372270125e0f3e9b8f19ee9ee7bb24fd3be3cb6baec06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that lead to compromised CMS uploads or disposable hosting, likely to trick users into downloading malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086afa5de5b2---92291058589.pdf In PDF document text
    • http://euro520.net/userfiles/file/1622790519556430426.pdfIn PDF document text
    • http://beaszemin.com/files/mupeluz.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/17742336870.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/vinosize.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42065d168---58126112506.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ace2e0465---26743902128.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/ludututosijuxudonusogulid.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/sawivepawugefipegewunose.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/joxetufawatebaroko.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/134f7a7c4813d03686b84981ea01ab19/zefuwipikeropumituv.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/efdf00914c1235a73808ae970802892d/83733285442.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/30a40bdef060ba4078cfbbcdff5531cb/12075664138.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f7d464e4---39840016232.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/tujijakejejimuvu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4948a31ec4---74809463422.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56efe2fb5a---249356697.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/cc16d21cbb094c2b3b877c5a706dd21f/99743870852.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/30862097586.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2870b09e---zabunawiduxenesujok.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0797105c---novejagasajugisu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5614e1ea---gevijetegujuvo.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e01fc9db7074589e015112b5feaefa54/42544730710.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wobedewugafabariziga.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd9d7d8d7---29293179635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+f9+full+movie+in+englishPDF 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_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 11024 bytes
SHA-256: f8bc5c13c43bbfb1b94d451d55f911139556d44413111b0e4eabd34849c92aea
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 16748 bytes
SHA-256: 9a89a6a2beff283d5c53927ef61aaaf796ff4f90d57757e79a2f34599c259e07
font_02_sfnt_off00013cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.