Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b09e336b67b02a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 07:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7879eb8630fa573b7edd4f0445eba591 SHA-1: 15a126b24c62e45be372d09f327e26527b05f961 SHA-256: e5b09e336b67b02a5fb1a487748d110386b860cdd7b028c3a45c40947ae2307d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The presence of external URIs and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://oniceh.ru/uplcv?utm_term=arquivo+pdf+converter+para+excel PDF link annotation
    • http://logtech.cz/foto/Image/file/kewadixutaj.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mokog.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fdc9b884e0573f67c753cf7dae034894/72394165922.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kovadimuzivusedas.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bfa77993832c4ccc8c9f472772bc850d/jakugetowevuvopu.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/vamapozuratigu.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/rolowadekubimiresu.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/gajizositufoj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df437cfc92---83559154275.pdfIn PDF document text
    • http://gptools.net/userfiles/file/dibesedisaxozolikan.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608248b9a8f9e---ximedajimirewawobad.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/38d748da0aed6e88153c8806be426294/zodomesuwomawe.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/tikusafemomemogejaxizot.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/6172016184.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/26795929798.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/30993659502.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/327906277.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc96bfdb2---42966385437.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/34244060704.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vanizodazedakorota.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinofivuwogegimadukilo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/t5phoc20t66dh916fppboigfhp/saxibisivedipobuwa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9573f9c6f1---99938557375.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/mutuvusiximapesexajazu.pdfIn PDF document text
    • http://beiks.info/public/file/16996867716.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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10840 bytes
SHA-256: 907fb930b3dd97d1326bbfba9f9192a13fe8e74c9ef7093760f17cf686c91ff9
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 18060 bytes
SHA-256: 94ea43935a1fd819b623afd49ee2ddf2ab9b4bd7e9721b7fa444a7f95aa3e88e
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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