Malicious PDF — malware analysis report

Static analysis result for SHA-256 957dfc70122e5518…

MALICIOUS

PDF

105.3 KB Created: 2021-08-02 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dff9586a80e1c84e584f0de05a0e607d SHA-1: 2d25ded6e7f97ed634ebbe19b158ee5ec4348b10 SHA-256: 957dfc70122e5518d378f619ea84509f55eee75c2a8c274f87cd3c9f4e3fcbe3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9613

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://al-farh-iq.com/upload/userfiles/file/pasajuw.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091964f7c039---zobojusunobupapaxusabim.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/nunexonabivijufefitowa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a256e4bfd4---lofakidafirutob.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051723221956.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/bumudutipazotovisivisope.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/3649716439.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522235625245508.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160959437df150---jovogavakejike.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/11798399076.pdfIn PDF document text
    • http://katachizu.com/img/news/files/bojenodigixu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bc71548952ce8a26872294b08ad756d6/82196217908.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32e91c0bc83c7c0acb5d065f36d2b114/taduginojigifewuzetupad.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a938286da---mijaju.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/80769511598.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/72506641424.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/zokuwapo.pdfIn PDF document text
    • http://minipit.com/data/files/4180601542.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8l06levhn7u61sjq78ghcrlav0/98997732038.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/lapupukinetojomina.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b119e82e083f80e4e219b9bae632e31/94171128694.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c077019ef---55483502837.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/fenarewazivabojapikukat.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a859dabaa41---17114841834.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210621005044466891c94e3d.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/getabinetunuzurikavo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gabuwabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kaze+to+ki+no+uta+anime+sub+espa%C3%B1olPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00014446.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14446 18676 bytes
SHA-256: 69aeaad85ba0cea0879e9adc363ea79c5b6bbbeaa0933a72c15a77bdb8ccb864
font_00_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10904 bytes
SHA-256: 9581613421c2e2225150da0eceaf768bd7f2f10ac5a3a8b787261ba6f446fbdd
font_01_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 3164 bytes
SHA-256: 4d8380357cac3a13e6a6ccb5453befc801ec1237277484bbe16c293cb63dc986
font_02_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000161d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D7 19528 bytes
SHA-256: fdf8f9bc75bb1c157417e3248d1d18cde1da4006b37969afabda50fc09192028

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