Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51a6865b650d7fc…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 07:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80514562719f316b22da374aec5d47d9 SHA-1: d38722b1a0fae1ed0e89d2f09eb7727fb5d7771f SHA-256: a51a6865b650d7fc637bd82d971b6c36aadedf0d0bd3a94d4f9fa74d6cdfd468
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites and others to disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kolesnikov.pro/ckfinder/userfiles/files/23131709378.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d590dc417---69891021670.pdfIn PDF document text
    • http://space-edge.com/upload/files/14514650539.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/83674405722.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/nuwovuwerelifuvofeve.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l8oaa30u2485qhupeeotbrn990/dumeguxazom.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f4c0add5368d42623b06755774cf1b7b/xiwol.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepalo.pdfIn PDF document text
    • https://blogsma.com/files/posefitavujuzog.pdfIn PDF document text
    • http://holzweiss.at/12123297212.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/16558452068.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/vafuvubusovovajumujaverir.pdfIn PDF document text
    • http://generaldistco.com/images/file/ruwofan.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/5335108328.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/709213300.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/299f5936c83474d286112a274a5c2ce7/9493841887.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/tolupijizawitamaga.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/xenokabetalutel.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/19394266530.pdfIn PDF document text
    • https://photojet.net/userfiles/file/17566960995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lock+screen+samsung+apkPDF 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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 21036 bytes
SHA-256: 0f2bdc05eb46b312dff76f9f9037aeddf424f3238a09936dcb31dc3da03de7f2
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10628 bytes
SHA-256: a788b4430c0b960d91513c0196024838c240fca9b2c661a384d4c307135578f0

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