Malicious PDF — malware analysis report

Static analysis result for SHA-256 be463ed4b67fe7b9…

MALICIOUS

PDF

96.9 KB Created: 2021-07-01 12:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 735799e9a2173931e5d4deb2f8deb4f3 SHA-1: 8af71d0b4f539f10d3afef750767459d49f420c4 SHA-256: be463ed4b67fe7b9c441adc521d2c2c315fd8ae352a05d9641abce6929fba1c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=laugh+out+loud+halloween+jokes
    • http://goldnumber.info/userfiles/file/gupagesaxa.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1muh2i76kp7o7cft761vtrld0l/63476130820.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ebec40ad---60019112947.pdf
    • https://bwawarszawa.pl/upload/file/turanarox.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9146215f40---41906261627.pdf
    • http://industrialdevices.in/uploads/62945923298.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4801f2ebd6100a34c09ae4a890e8f3c7/43518423084.pdf
    • http://ibconsulting.it/userfiles/files/nekaseb.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/4fce4ee16bbc426f7789c8f5b36c52d0/diwagexakunugoguwijozew.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b48e5b1a3---zisijesumejul.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/01c6f7d309881e54ff56f22aaed5b221/rafato.pdf
    • https://nestuby.com/userfiles/file/kogutu.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d186cf54f---54764339556.pdf
    • https://valve-toho.com/userfiles/file/90315324460.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f3cdff9659614266e58721830fb64147/jaxokojuxupoxaxafozazu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8834cb671---pimikele.pdf
    • http://lg-palette.com/upload/files/41464352187.pdf
    • http://ngor2-3.com/file_media/file_image/file/16130065662.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a3178511ac144cc17e3770f5e0e7f44b/taxotesotavina.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/20b787055526a464f316ffdf0d19067e/56665490494.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc21c74ac8c---gomipotasixaronezejovo.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b433a7e2ba1---nodawigelafudutovisiguk.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/iq3bjprd0p24oi4966tqqnddv3/saxibopapivas.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/696c3277295ecab93dcb388f04fced66/pekelawuvax.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/86453435613.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baed2b2525f---pepakefifejiwiragaxa.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_off000114c0.bin
cdd54c014403f5dc94a6cd15f4a666979e0235f834ceb614a0934b750ea1d6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 19160 bytes
font_01_sfnt_off00014577.bin
c619668521485c86bfae58d30379ebb6e4ee9302c56f97b504221dda55d48559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14577 10700 bytes
font_02_sfnt_off00015ddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDD 16792 bytes

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