Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9fed54d8fe0df9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 03:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: fe0c89b649b7d7e384e93889592669bd SHA-1: af65584b24ae1bbe967ab71fa6052202b7bdf368 SHA-256: ee9fed54d8fe0df9700d1a367af3ea9a9ba74c364d5735a02ff03c7f6f59cbc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=minimalism+design+pdf PDF link annotation
    • http://activesolutionelectric.com/images/file/folanisuzomijinepaxiki.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1umemp7f191genh630fsgk1073/45525442761.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/f78d7832389b26b727efed35b0d01869/xanamepofab.pdfIn PDF document text
    • http://szpk.hu/_user/file/gizasarapiwinozom.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-27/20210627205639562642.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/gogekipaj.pdfIn PDF document text
    • http://geodez.com/pliki/file/zebogedijepilosopinidel.pdfIn PDF document text
    • http://nessium.net/userfiles/file/91524080637.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/revanosefojepezorapi.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/65044130496.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846a580fc0---31555092008.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/54e26062e7d8e352c87d29e1ba23b8bc/zulejakaremexoduvimasen.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/polidisimotofulod.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/23110426923.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mokapimodatepuvisexap.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/fexejukinejojake.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/rezosiji.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/radepukolebuburolop.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/7dbc22cac5d74e5c21090984a1d1c3d4/jinitavizat.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/xadimevisu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5ba69ed4607ae489375490bc9b108438/xuzabepuxuvuvifemo.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/47049513326.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/kobajug.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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 18576 bytes
SHA-256: 132d3443d93e26f18f51c072ad67bacb12b619dc6f9682c0d8c270b268d75350
font_01_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10516 bytes
SHA-256: 8e0c1953ced28a229dceb0253b20c8a8809ac59d9bce0d32d2b0d9f7b0a2dafe
font_02_sfnt_off00013c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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