Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33d96fa4e28fa8c…

MALICIOUS

PDF

91.4 KB Created: 2021-08-14 09:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c318cb663c8de6ae8a6de426c86f320 SHA-1: cc5a89f04152e55f3c5703ab91f03b02475c5395 SHA-256: b33d96fa4e28fa8c8a368f2bb0ababf2b4832d4a60dbbf1badbb280b50f91ec5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=mini+militia+mod+apk+unlimited+guns+and+bombs PDF link annotation
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nosulesomagowabikolule.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052502341268.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6bc6704f1ada51540076227857df1568/busudofugezi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252aaf4bf---75839948036.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/pejag.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe35040942---22261191171.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/36432787109.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/minetufigaretakemufal.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/35168353526.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/fakukesami.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/66964523015.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1556a4186---daxonukudelilozo.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/37447509397.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/83963078594.pdfIn PDF document text
    • http://fructusartis.com/i/File/zegolelezogijerelada.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6097oqtgf4fgtnps548655k0q/xisik.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/zijamenadezure.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/58934160167.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b591d568640---57117490854.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nufaxobixib.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/98843775778.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf20c32797---tolegorifadenapiwafovolut.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/af963786e112321adba94c78a376df9f/43437447070.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6d4ehtqmip9skvl0oigqe4bghr/sutaropovarixivulaxowupaf.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/re66argkoiakkc4qp0kvtrc5r2/kojilovovef.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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 17520 bytes
SHA-256: 9c29e80dad92b898b999fa7c14ff8c5cf6fd94c25648da957a6b6ff51e9c32dd
font_02_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 10960 bytes
SHA-256: 4da85d3f9b3b10790388ec4d1f7ef87026abf2c029868037a6cee2cdf6405bdd
font_03_sfnt_off000149c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C6 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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