Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8b0b2238b44d10…

MALICIOUS

PDF

99.5 KB Created: 2021-06-29 01:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef5c1e302b4ec1253edeb994f2faa717 SHA-1: c2489b26272bbc0e09d1a60abb493393ec960a54 SHA-256: 9d8b0b2238b44d108df49dc443a85903d3a4804ad52a898a9a75f8c71082af8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e44958bd6---dofilolutilojam.pdf
    • http://pwr-tech.ru/userfiles/file/2373867008.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31103e2eb---xirupovusozoga.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a1e7bc1b---zoketujevibites.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9f5c5d69bc50d5071f053329837fa8b8/72515047291.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/75b1a80953a5d4a3d6d3cf2554d37fd5/35861707007.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/9d8d523c8b3d989d81ce55676bcd15f5/dipetegozurupuf.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5c7349312f1f72e4e59e82c8495e4024/21903270358.pdf
    • http://unipsyclinic.com/userfiles/file/20210524163105.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07b9842da---50678633741.pdf
    • https://pristineleather.com/userfiles/file/42111655959.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb57854223---55674969060.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/wasubeniwagozapun.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fafe86c58c02a37fe54af9993c87e3d3/ruwijiragam.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078768d3480e---dimawelevu.pdf
    • http://ccswcd.com/userfiles/file/mividaredasigitud.pdf
    • http://hytechplus.com/userfiles/file/64485080007.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0034c5bcbdd3de588f7132af0a90f787/gijasosag.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5d1bb29e---30269950133.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a467cd4cc6a---kexikuforevazugomal.pdf
    • http://hanhthien.net/uploads/file/25143484638.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dd36cad6abb706385e156ddde1055f2a/rejobiminitudazumod.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e3c2be96---jeziwitijarurodunawaba.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/76cf2b37ff773c653159326e95717c09/27318427634.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sin+inverse+function
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e97.bin
d66a1f70f1e16b8f5a073115c59422c03e24d99c1875d18f4838bc70977a24af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 19084 bytes
font_01_sfnt_off00015161.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15161 16792 bytes
font_02_sfnt_off00016978.bin
b1cf8cbccd70176ee45147c45a64ca101c913781b2046c25fbff549dda17986f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16978 10364 bytes