Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4961be54ba91ae7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ed9dbd593089b74306f49736dba23e2 SHA-1: 37f89d2ef7663e242a9be4b054a62218b1021222 SHA-256: d4961be54ba91ae7fd6ec588b718ac78c723eac710eefc34c518e8b7442074c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URLs, many pointing to disposable hosting or compromised CMS upload locations, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=how+to+install+remote+adb+shell+on+firestick PDF link annotation
    • https://kawanmto.info/contents/files/piviwaladimenewedoriwu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38e70c028---wivuwidikogifesovagiser.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/pakolapujipelunegaxanonin.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/2723579151.pdfIn PDF document text
    • https://activepymes.com/pub/file/98631903375.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8co6taedik2s8tubee1em2p1v4/51555444396.pdfIn PDF document text
    • http://exosushi.com/uploads/files/xunuj.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tupikukufumiv.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/29228441314.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/puposuwaw.pdfIn PDF document text
    • https://5uempat.com/contents/files/mirigivozejarurigeja.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613692b8e2df5---sikurefuzuvatodewo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161413ce918501---64170479885.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/75052297958.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/20403812860.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/paguviwuvezazotulifi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8a7749bb42bb7cf40284cb3d7e66d8a4/nokevojelirufajukimofisir.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/ziropowuwifezejanixe.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/garurobozijilemopedora.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/46151973565.pdfIn PDF document text
    • http://unseretochter.ch/images/file/94047664484.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/94191545361.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/ropulu.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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 11052 bytes
SHA-256: 9595715e9283e7360418c84bb41dca845c89ee1b229aebbf5fec8a4542e3d105
font_01_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 17060 bytes
SHA-256: c0fa80ed993932010b70326bb9086c68fb35dba179b1489580b157609dbe6a3e
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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