Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937716c2d999baa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 07:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 458224936bcb06801f8c1827695f5ada SHA-1: 0ce23b370da4251521873d13f3543902a6cfb920 SHA-256: b937716c2d999baa619a04167531020322daaccb760c4b0074fc39f29d92e229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the overall structure suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=the+journey+home+radhanath+swami+pdf PDF link annotation
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/fifevorifijuworuwijopi.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/96772937716.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/sekawidofowojer.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/d537ce3c999ae898aa6f4eb0824a6a31/legatasenetakaxinuk.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/ripedepetimetitofagovil.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/waduwixelexupisane.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/vigulenutit.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/xavemuxo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/81f22fcd4cd221f41f8a742f8a05095a/gelod.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/5160963258.pdfIn PDF document text
    • https://langumeistras.lt/i/File/kixuxetiwagogosotisijoke.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f0okaa5kcd4852jnmom2t6ugj/33336590177.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/jarugokepesobogalo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16123454328aaa---86072358190.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/fe94e27f1e3bf6dd914bd13c7efb94db/xojozuxixito.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130417d4f6c6---majuweginozokod.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/65706430196.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mimaviparo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/45d1b419586e4528317f0a4b8bf8b044/bunavupevesuzogu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3c7e96ad---gubopebe.pdfIn PDF document text
    • https://waroproject.com/file/35543289873.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/dexalojexoxulo.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_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 11112 bytes
SHA-256: b0be45bc3f776c16ffc96a314417780f762186b9d556fd8e7837bf1826cc5679
font_01_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 19864 bytes
SHA-256: 1fc9469f4c5bf21a9c8891ca75b8f2419e01b52eb70bdb516fe0661873059b35

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