Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b7fbd20faf5e12…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 05:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0df724b0883da2e160d74e71c490c41 SHA-1: 133ff68ed1bac3f7c0bc4f63809e7e70076443f0 SHA-256: 79b7fbd20faf5e12aade0c8c906a18a119098614c81129e8694f30dbbbc42004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=copywriting+palavras+que+vendem+milh%C3%B5es+pdf+download+gratis PDF link annotation
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/8eapjd5eocv3u04nrgjfidiga3/lilurawonudexufenejira.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/nekiponobigexapuwutora.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/wajijejetewifovagebimoga.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4a01qhv0qlv0ovjkbcvjp9elfg/gurulikoz.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/14118654749.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d224ca9f1---miluxapojafuzav.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca71fefe---82574396352.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/julupidixupakawavobakakab.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/33603804282.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/64170097400.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jarel.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/jatizereberiz.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/78229657760.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210716044823311.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c96cf8cd7d1ae1de7f2135095746e217/1682800275.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609854c43b8b6---8419139242.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd8ce9c6c---bejolinodenami.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210722_11E2009EF79D7BCA.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/nedepubaseluje.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/29765297169.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161077cddaf01d---rujomewekovubebasuwixip.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb147a573c---63105204168.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/netumapinijagujifugidax.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4bd033df9021ea1d311eed5322d7b559/72084525534.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/67836165631.pdfIn PDF document text
    • https://hiroyoung.com/data/files/23600365297.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210819_000328.pdfIn PDF document text
    • 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_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 11712 bytes
SHA-256: dc8c4ef63eea6a06d85006a35ef324e24ac0cf74de64953f2d9730c59c28f978
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 20608 bytes
SHA-256: 39bd81ec01960c635605186a1b5e9c9d22d4f3aaa1ac57dd9431598187fca975
font_02_sfnt_off00014428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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