Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26706fd4829fb8b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 22:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2d3a83a27c2d315f0e136704d4409bc SHA-1: ce5ac290420df44fb3b09ebd7d06043d2d2f9e57 SHA-256: a26706fd4829fb8bbf0b67fd792ad627c8e3e9ae7111b28e72a4dfde61d14b03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious payloads. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc38a58031---dowunutefegusakesemuzuno.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/uom4tqdsk8iu5kbrec03vvrmt3/wunepuxumimiwokejup.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e2b7c0e511d317410133ea28f63cad38/99006364771.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/cbd2c1a364abd5a645e913dbcd158c0e/56525309876.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/61e65f58d7d0173ba3975564be02d608/96537931080.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cf6bc1e602fcf984b9eec4e6a2767180/wuparemewuzeremesuxemuxa.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/vedodusiw.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73ab0fe33---xuzetadudujepuxi.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ed30f189f841571665c6647f44bd9f72/jabejizigujuwiro.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad422733f5---24108973062.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ckd5d76euab5gkeemi7t64p3m5/voxuduwadunogonoline.pdf
    • http://esthebel.de/userfiles/file/40001511626.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079512676a86---79729939804.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958d4e2b2e0---bivewiligedubolofumal.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a3918f36d8---18166998406.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/419481309d56ee776109f3cdb019797a/tizekixofegelifazisa.pdf
    • http://mientrungpetrohotel.com/users/files/2197214078.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f857fb59---tomogafexunuwiz.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d964339582---liniwanerodanumup.pdf
    • https://topclassgreenery.nl/images/file/safidaz.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/op4q2fh80f3996s6btb2e85rvb/56265692268.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/07ejndgltnb0q5sdg4df5ft33m/49446892570.pdf
    • https://condicionamentofisico.com/arquivos/file/rivanuzexuxad.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/af3caf3d1f5deb73de606bfac10d5477/44951904882.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/rusigividotavopimuzumeti.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed4a5194e7---42723567444.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=call+me+by+your+name+full+movie+part+1
    • 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_off0000f8cc.bin
1c847d3170d7e36269df40bb2d2b9ea74c20737975e1b5175085459150397e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 17224 bytes
font_01_sfnt_off000125df.bin
1d3b81ef2087059c267ade03b72e0cdea389c88192d5024eda3deaf7369a2e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 10852 bytes
font_02_sfnt_off00013ec8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC8 16792 bytes

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