Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2349c719bc77f7d…

MALICIOUS

PDF

120.6 KB Created: 2021-09-03 23:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 677bc8ef5bade7a6cf7bb1c894d97fdd SHA-1: c60ce9ea2a8a5a27ef0077eaa19a28c1fa5b9f54 SHA-256: f2349c719bc77f7d2fe632708a554ea2517378c69ffdd3898f55a05e60f0fa5c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver second-stage payloads.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jvpom40u0p8cc8hddfunki9303/15686465182.pdf In PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/adbe0c1ffcc2e2ac5705769993a1c5c8/37310805981.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7db761544687571be373643fa6ea4d06/tuziledirodanowax.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1umr6ustgq7u87qjljfe6vga7c/puvudopak.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f818d9d31af---zutovamofepebutavopidulos.pdfIn PDF document text
    • http://plncse.hu/php_data/file/37162467723.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/87451099392.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ioafhcp5g36ucv9cukj6qfq0bq/basetewugisijugafusuvutun.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0f6d7772---58792306537.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612460a1852f2---penavipalekejanoge.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/44148066188.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4689d5cd2---penapovemoriroza.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4efbbe87---jejutuwelu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jshqianq4ncqjmv3ug06j8etr0/6364344279.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/20895158570.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/18097393780.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210710_94CA3F917278AD20.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/ripupofibufotezubomeferi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s2gp2pdco68gccjvvje95k762s/63972796565.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d0e9addbb---polakisaserajazalo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fhhqa714jmp45n093efjsabot6/fimubo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3206450476.pdfIn PDF document text
    • http://gdfsztal.com//uploadfile/files/44291292034.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/kanekedifirulusovapekaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=project+gutenberg+pdf+booksPDF 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_off00017099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000188ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188AB 19364 bytes
SHA-256: 30fb403ca83d79847249216b2895d57a217263250c6794f0d246b7befd2a2364
font_02_sfnt_off0001bb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB4A 10960 bytes
SHA-256: 43e5974981a1c0af2da5d20013ccd822b7fec9c8e669153298dd61015c83c4e2

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