Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d77a5b6aecebcfc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 13:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26c1cfff192a2856c483fc3e1cc5801c SHA-1: a5bce1d2f611ec6ef671c36cebf60daae4f9d6c2 SHA-256: 7d77a5b6aecebcfc1afcf79b0f0c798e07929b1bc9b14e55febb1384cabb9793
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of multiple external URIs and the overall structure strongly suggest an intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://an-professional.ru/img/files/file/zosefujazewaverifabelavu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o7qpffpuvhvlbj1g07b0l4mruj/nezamuxezagafiwijalegu.pdf
    • https://exlite.it/ckfinder/userfiles/files/96760352302.pdf
    • https://dalilak1.com/userfiles/file/36684222310.pdf
    • http://ehomeforeclosure.org/images/file/zozado.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4ec69657---59483679030.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/dipavitepomefuvigu.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210822/0641541247.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4ea6defbb6a590616e83abd73acd91cd/pumekumawugifezid.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/9e35a11397f611cef03d096a66230c63/7501506584.pdf
    • http://speckletrack.com/update/editor/file/xinurusovanofedajovozuxi.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ql7ifqfh2gm4dcl2s7d5sfdpf/66618806030.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/53500908766.pdf
    • http://bnblspecialities.com/userfiles/files/fisapewuviminituzazomataz.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/rokasana.pdf
    • http://gilendor.cz/userfiles/file/muxipatovu.pdf
    • https://thietbidiensino.vn/media/ftp/file/38597330677.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100da193117c---togidolov.pdf
    • http://lookkorea.net/userfiles/file/63828768521.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a8f3b78591ba77f707441cb2b66a489d/xinalefomakelajul.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9af4d28e---rujuvebideliwisafebawod.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/faa4e6cc8336d008e692759b7796983e/wikuwisidilejulev.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce77ecd41---mexavorufupileso.pdf
    • http://pivotal-technologies.com/userfiles/file/67455064081.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=consumer+psychology+and+pricing+pdf
    • 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_off0000ded1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
font_01_sfnt_off0000f6e3.bin
93b5b95beea7681527709e688178060ab651ac58a1736db1e808b9482c81a567
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 18068 bytes
font_02_sfnt_off0001258c.bin
4c47646c1d651e77be8e9a8888d180ac2b54855caded2df80d50807f018eee47
pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 11216 bytes