Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96580a0e25cb8b3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-11 12:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92e4721692a9192c71f0ae03c6871070 SHA-1: 28b2bbc3dad1a4bc0d072363f5d65279e52be7ca SHA-256: d96580a0e25cb8b3510e72a1cbce61fe5ab12035036dfc11b546ce045f10b9e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=rgb+to+hex+converter+online PDF link annotation
    • https://phukienbep.net/media/files/gukovezoviwaxur.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29882388507.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/bevotixezerakokuzuniroluk.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/rixovezepisef.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/nobinibijiva.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/59245833442.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/jawovuboga.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/49949693882.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/32068332220.pdfIn PDF document text
    • https://songhong.info/userfiles/file/68106730648.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/46429227528.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hh88qpia0ui2192h8vk3akk5k1/waviwonaripajotituselob.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/59356313671.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/11087652346137401825ff0.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/64264491511.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/48766934684.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161395db8c4b04---vegunipiru.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/tubogavalixagaxibagexe.pdfIn PDF document text
    • http://teplospectr.ru/images/files/digiwope.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ddc9bd813df21fc4a0a6dc4159d60825/35992328939.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/14736144011.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161337921ea9f7---jixotipiw.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/71778426099.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xemotutuse.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210908_095817.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/tidav.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_off0000c545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10532 bytes
SHA-256: 3a4f07d2f92c16ca108fd19f88ffd7985a377bf7b137fce039a46166061d76af
font_02_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 17900 bytes
SHA-256: 0b007e29523625b7b7e5f20767c80d278f34b724e524e07ea0e540f23bc79bfd