Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab532e8024af53c6…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 10:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c02777cfcfa4532071ebd6b912151b7 SHA-1: 4c5aef951fd84503115234020205c9442bf9fb21 SHA-256: ab532e8024af53c61b53b0b9eeed2e68328ae37cacef08393eb007e576850b68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The numerous external URIs and link farm heuristics indicate an attempt to direct users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=redmi+note+10+power+price+in+bangladesh PDF link annotation
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/76543711505.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/fifukuwiwuwopuzakeduzofon.pdfIn PDF document text
    • http://sentai.cc/data/file/20210907_083437_561.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/lewazepazuxuguzanaxemo.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/80554260733.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/10555677348.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zobugasulukozenan.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/89437467722.pdfIn PDF document text
    • http://happy-land.hu/editor_up/dikedepewufibosoxutepone.pdfIn PDF document text
    • http://dgjst.com/upfile/file/36893703370.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/gilokubazariza.pdfIn PDF document text
    • http://baove247.org/upload/files/43551641520.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161472922f0453---musafer.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/45566689032.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/fusazereletama.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/39194431793.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/57075723078.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/jeruxunakuxokipisu.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210914081431.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/kiripimirofogujewijotut.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614018a33c9be---41124881156.pdfIn PDF document text
    • https://jss-moms.si/upload/File/11724598755.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dc6dec221---sowipajewirigagemejovuz.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gefavarimit.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_off0000b565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB565 11408 bytes
SHA-256: e4219d6f9ed6a6cef9e2fcf4471b0594171e7ea683a598ea768544ae5c2b21be
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 16944 bytes
SHA-256: 9d96cbb231c0016d15886fd7c52301d085ac0cd8e998d7e8939cef8dcdcfa6eb

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