Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f66714916de637…

MALICIOUS

PDF

130.9 KB Created: 2021-09-03 15:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3206cd852531a8e5e34bf9e6e19a28ff SHA-1: 9cd41af17024dd4c76cb4b89e47cb49132126fa8 SHA-256: c8f66714916de637645063f89877fedefba60eb5078cd60324af4b7088e8f453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pet-fashion.ro/mm/file/53855230480.pdf In PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/raxodovo.pdfIn PDF document text
    • https://superpart.com/files/4562956672.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wepuzoxazunanido.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/31459655922.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160867f9aeed7e---vakomexitamoduwoso.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zubikofovesi.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/pixupoworikidabuxe.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/supokanuwevezode.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pitoz.pdfIn PDF document text
    • https://senhewood.com/d/files/toxomagarotawomupegude.pdfIn PDF document text
    • https://stopserv.ru/files/file/zesikosuluritepag.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5dcf88e3da3b7e11a5cb29af075377b8/gijewuwuvoz.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/53308550461.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/fowabubomovoxo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/50adbe9c61d333b539f943a1547b854d/84928751769.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f089a3724c---16576425446.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/sidegijujizimirug.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/67310423038.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609954fb31d7e---vosozukobilovun.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/407f9407d6fd072f341c1671548c8d50/16176884015.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d4d2651a---buruviwitex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=alibaba+group+ipo+prospectus+pdfPDF link annotation
    • 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_off000191b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B7 22940 bytes
SHA-256: b8ef4678cb64de85c7df7caa0545db9c8cb28efd32a91d37f69155d86ff1ac1c
font_01_sfnt_off0001ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4D7 10912 bytes
SHA-256: cf7deb9099c9872b4861ecf0a148a35e815d938703e3575fe7cb1795b1bd3b9d

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