Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc0b46bea517fbc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f51fb62f88d55e28b3b3b102f9cd093 SHA-1: ae532696a89abab980771c6ecd1ee52e897a2f97 SHA-256: 3bc0b46bea517fbcc78c377271a4dd684101a4432f6579fd7b97f773956fe3c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The numerous external URIs, many pointing to compromised CMS uploads, suggest an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=marvin+casement+window+sizes+pdf PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db20555a148---699760066.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210817162920047864.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612066ff7f5bc---kawugozerobod.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8tfov1vpt7a4q27l1t34mpmal7/merodel.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/zajidivu.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/filitabatefira.pdfIn PDF document text
    • http://cascad-trans.ru/files/bejaxutebevufowej.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/4624353088.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c6f395d691c3b889af82c2e08d4157a4/fajonuxe.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iq6bdiq8h197flk7208eiefn5v/29753280625.pdfIn PDF document text
    • https://luminex.pl/upload/file/gatokolafo.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/89351460188.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/12b56ec489a735856f3f1a563affba1b/dedoxunugedopebit.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/87602282092.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7f105c26---paleb.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0e32a82ebc267ab12968816452521574/65845749634.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d82bbd2f---18374133821.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/888da476f7e2e542495aef3e40dca4b6/52382015024.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624381302.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84nf8b2qvuem4st0b7dadtef23/95711644227.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/ledakisirigudal.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xajogivekikejoj.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/fasagavebawokamiropexewu.pdfIn PDF document text
    • https://el-tall.pl/pics/file/94178825468.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/57305422700.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16640 bytes
SHA-256: 6bab697252aa1930b3d3cc0612847d72bd96079377b764425dfffe87163fa4a2
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10940 bytes
SHA-256: bfac0968e27271fa138c1e7fc764ab4f329f2877eba9d8793978de2e077468c0
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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