Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aec4d0532476476…

MALICIOUS

PDF

88.2 KB Created: 2021-08-03 21:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a153f466b37cedbf42921509a4473360 SHA-1: ee94cbd581550b1ee78d5979cabd0298815d58a4 SHA-256: 1aec4d0532476476aa94ba167836e9cf5ae2671cb17b5c88dbbce59d09c5cbd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://veiligheidssloten.nl/ckfinder/userfiles/files/bodememi.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a0fe4547d---tinunomopoxowaxevo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/44596038892.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/sapedi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e8ae1be58e3540448cc071ea69ebe42f/32072971857.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kudezidef.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/wedatiwupopikopizepade.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/levovixuxeguv.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/zofemefitotifitexadem.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e0a0e6a07740bca0aaa45ff0662849fa/24219893762.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dc906068fdfc4d4ad914f11a91758f23/7228230335.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d803a0bf8---5563473512.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e53jpc4fnhurvao0aj986mk205/38317038831.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/32390706444.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/tetove.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7fd4ab86799d8aca8076549db9f28313/jazujijisakejitijosofotep.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/70788114773.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/24467158603.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ede61dcb60f---54123150631.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608871e6532d3---62419764219.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f357896ff148c4edf22c04aa2a52c82/82637786713.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/77290828617.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7080402c2d---31790971789.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zorilemawajigasesotajored.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/10098977045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dashing+cm+bharat+full+movie+hindi+hd+downloadPDF 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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 11316 bytes
SHA-256: 116d3e76710b643a6585071b762f64f7c7f3368cf52239db05dd7a051e957c4f
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 17352 bytes
SHA-256: 8ec0cfc6a5db84d47ebbb734e11e0c0a2e26c34a66dc0a26397254d2e64e1860
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1