Malicious PDF — malware analysis report

Static analysis result for SHA-256 242d0166f0e4c755…

MALICIOUS

PDF

110.3 KB Created: 2021-09-05 16:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e054585164ca160ebaf3b0d59b0ec9b9 SHA-1: 485a29ebb69352b9b4e16dc3ce15af84a52121a7 SHA-256: 242d0166f0e4c755c7797304b32275fbd2d3ebf8780a582d27c6be20644d710c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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://smidgel.ru/uplcv?utm_term=international+phone+codes+list+pdf PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/isg1ijq5m46cmbqkegu1gq2dpq/65264537345.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160749f999ab79---8091021565.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/88872353275.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d925094a0---98641080187.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/zobinikuvup.pdfIn PDF document text
    • http://balone.net/_upload/file///61164875388.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/54518376177.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27fad52d1---suritiromu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1bbdc44589d04fa7a57ee4651a177549/18058221632.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f8976dafde48a0d174d3fbaf88ce4188/46919764246.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2e5f1001707f560c2f0435d2a83d0a1b/tizerutijivosotobixap.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb29336edc6---51673732913.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/wejagefonurovamibamos.pdfIn PDF document text
    • https://akconta.com/uploads/files/81288370452.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/pebijelurukuraxalodiredu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/36113790427.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/93552247506.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/vudekanuzifadi.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///49494507357.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/58498751721.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/104919427960a2c7d1e7f07.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/32241761272.pdfIn PDF document text
    • https://icbacademy.com/upload/files/xamodevikedoku.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2be7250b9a370464bbd80122f0b711c7/29553300910.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/30848251588.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107275016b3c---54156323974.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 10668 bytes
SHA-256: 04b15e184d23e59859c41afa5257a277c8e3597f18af7fd7c939614057f74cc9
font_01_sfnt_off00014b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B29 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off000160ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CE 19008 bytes
SHA-256: 0fc6d71190b4a22dab236de0965ff2f50377068fc8ca41aba3fe7104fb6f2be4
font_03_sfnt_off00019283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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