Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b53c5a76b43310…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 23:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdef245326ed486abdeb91500ba8d6c9 SHA-1: ab344a60cc706872e0539ecce4652014a8bde799 SHA-256: 37b53c5a76b43310e057dfee6159d3750b2de289f60aac2a78954a5e3e4489b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4f669cf9cc26dc769ae448ca9a39799c/ruxilutumonikawumon.pdf
    • https://alatheir.com/atheirwsfiles/file/48127392191.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/628736b3b411481f9a5bd951049eff38/92425378411.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunuzajijewizovenov.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i3k7sf68b59u9m1gbqq1rkjsl1/40676462075.pdf
    • http://bisenzia.it/userfiles/files/74913941050.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5220e587e---97348997728.pdf
    • http://zuche0551.com/upload/file/63781962439.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fcd1898ac4cfdcd39fedee1abad7f119/91050574777.pdf
    • http://bigsvatcharasith.com/userfiles/file/pekijoposos.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5f2240347d75f6ea9a6d6e4330d50d88/49602860351.pdf
    • http://unseenadventure.com/userfiles/file/3421963525.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e9fbca0a---56613175649.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8fc3d84c---53765324035.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/129b743ab231a89a2315db273b45b8d5/91603261636.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a99e9aa73---92026600755.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8c50e829---10552512040.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9fcbe0e0---74378740278.pdf
    • http://aimic.com/userfiles/file/ruzari.pdf
    • http://adria-ex.com/images/blog//file/15343031498.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65db08563---94672389757.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085568c7c9fb---30838430941.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/03srlcht766sg7vnp9ut7c1rsa/ferapezid.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57f66f8b4---26150718920.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/bheilp1dqr888b7n1taj7lj45l/pokemibazo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2167699e8b---lunejuvovavewedagub.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/cd0f30b5270448f494e3aeadadb0341a/vomaruxotowit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=constraints+meaning+in+physics
    • 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_off0000f360.bin
ce7d1f5969c4ff2848fdf9b1f75a5b5097a7cb50f5e8491337524974f3800bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 10920 bytes
font_01_sfnt_off00010c8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
font_02_sfnt_off0001249e.bin
cab73dedbd23dabf926d60aa8019b4459705be57ed797e025b5689d4cc628db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 16604 bytes

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