Malicious PDF — malware analysis report

Static analysis result for SHA-256 62544607c58cf744…

MALICIOUS

PDF

89.2 KB Created: 2021-08-24 19:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d2b345276a432226c7b00488482f7b70 SHA-1: 52a85bcdfb76ceb0cfaeea9032e8e9125a6dfbd7 SHA-256: 62544607c58cf744b4c15ef1d4146900b717d24172ed91c4869d32eff8447144
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pinpointfeedtech.com/ckfinder/userfiles/files/vitozuperamepas.pdf In PDF document text
    • http://peneleos.pl/userfiles/file/13254567448.pdfIn PDF document text
    • https://kermanrooz.com/img/files/tepifoworasanufodeb.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8b600885f876d99412c73a0493496ac5/tijunep.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/3364913378.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dcdd38e3e0ad6936c237ae91e0573076/wubivufedikajosu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160815e6a911a4---zuzalamemu.pdfIn PDF document text
    • http://chongros.com/userData/board/file/9399748363.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/67799342264.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/riteximavap.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1349d54f---pemiwu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/38918601146.pdfIn PDF document text
    • http://cloverdiamond.com/file/82236425796.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/jipinigibujapumuwir.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/63289809533.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/07pubimcev4loj7kld306je8s8/52948556165.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160879b062614d---rerekuxidiwod.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fe4d6f2e429dfb135d8a2f368cfbc500/wexolowujifeg.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1e093e739---21648439797.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/13422179781.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/91183545920.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/roluvofagedadufamer.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84760e5d9---33603898289.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d422a35df7---90061874602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tap+scanner+for+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 17084 bytes
SHA-256: 5de15b0b095845aa435899d78529200dec9fab5daa20d57797db8d2626d61f5d
font_02_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 17396 bytes
SHA-256: 806ce886826426da2d2ee4c4df850f0442f45beba0008fa34436a50ae6c16a89
font_03_sfnt_off00013efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFC 10200 bytes
SHA-256: cd2842295e4da7616ed06fe95a54cb785d574428456d372673e4fe22fbd31cf4

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