Malicious PDF — malware analysis report

Static analysis result for SHA-256 a418f608875f4d30…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 05:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a0e2f2471cd0e9c1a59e3b19d5db464 SHA-1: 574d1c33e7d651823fc25230335c4b5376b63e96 SHA-256: a418f608875f4d30835f90fd9379a30ae2f995c19c35e688a1b6d0fda2ebe98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or to serve further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088758e808c1---kotogulepabinefuf.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/30779709095.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/wezukunaxizufep.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/setifutaf.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/22102518796.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47bba181c---15421618701.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijikasenim.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63f0255f7---fowevewiwikojarenotoliv.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/newefu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/dolejixujawug.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/nonotaxinopuloziromiwo.pdfIn PDF document text
    • https://master-service.ro/images/file/tenozufowagujubasiri.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/64844628264.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/568bccf37e71627b414a74909ba0332f/51429294918.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/pazip.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fd9fd0a1f221db28f7335eedf48aa395/miletaduruwimabexedinenad.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/4878460672.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae12da069---84189806302.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/j3vfp9126582r83jgo8voc21oq/rajif.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/28667491512.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/83208115566.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/fabusesize.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caae4b79f0---vetular.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e4ef0e23a36c546969de60eb5a05b58c/69903070198.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/bdc988e653584b3f84a19b9fb7f1f116/funigejijupunipimidobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=%CE%B1%CE%BA%CE%BF%CE%BB%CE%BF%CF%85%CE%B8%CE%B9%CE%B1+%CE%BC%CE%B5%CE%B3%CE%B1%CE%BB%CE%B7%CF%82+%CF%80%CE%B5%CE%BC%CF%80%CF%84%CE%B7%CF%82+pdfPDF 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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 28456 bytes
SHA-256: a398b2ef295e8f007a69f6f9b2bf7d8aad4c955f16ec77f30b0f833d0234d227
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 10976 bytes
SHA-256: 13f0edeeb390f6a7dcfa5723b4d73144916679f12242dc7abbe08bbb68c24cd5

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