Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf16cb3213560d0…

MALICIOUS

PDF

96.5 KB Created: 2021-09-07 20:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fdfb60a770db14e435b21c09fcf1a74 SHA-1: dc0bfbf95458d85c839faa4a699951bc5ca0d6d6 SHA-256: fcf16cb3213560d029ef012a0acbe07733beff373bd9cd19aee0fde73faa49d0
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous links and the use of compromised CMS upload storage are strong indicators of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://brilspa.ro/userfiles/file///60791469237.pdf In PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wunusosebesabokurarezidep.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/filudukinusofuxikun.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/nuvegupatelaxujizeb.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/nemumiralivelanefijevok.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/87c8754e9054fc9e200852f0ed7c0a14/biwidozodusoguvesuno.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/41507100165.pdfIn PDF document text
    • http://juha.be/_files/file/93254265150.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ce91dbe78cd8701d3b9dc64847cc01de/37604448966.pdfIn PDF document text
    • http://ave-france.com/pics/files/jufakus.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c961f9287dc59938faf92cead842ae1a/36761244786.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/39326289284.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9089733a---34218057325.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/1c5547e5a683532828395fb1d5cbaa44/46245601624.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/susifazururolabu.pdfIn PDF document text
    • http://asfalon.com/__files/file/62304877742.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/valupemuwaxujazelezorupox.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a219d9f8c1---pomasinegukuwogemusivi.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/38216884443.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bead3ac533e---suzanegalegegu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca70c2262f2---rijafilanifetexow.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61716fc04---vitutupurasume.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/topowuvuwepusam.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog//file/63470918488.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ef066f74894f5d3855370a81be93297d/91322326897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=animal+kingdom+map+with+pandora+pdfPDF 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_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 18472 bytes
SHA-256: f5b76b7bc37fc79847787820a43756709c9a79d2ccf787acb5db4ab639e3cb02
font_01_sfnt_off0001436e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436E 10804 bytes
SHA-256: 8faadcf910afd4919dc234ffd150bfb325fcae33837bf80c213294065db36e69
font_02_sfnt_off00015bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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