Malicious PDF — malware analysis report

Static analysis result for SHA-256 9640bfc24ccdb237…

MALICIOUS

PDF

81.3 KB Created: 2021-10-07 19:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a6e4771d8bee1d0e134900708ee9aa3 SHA-1: bd0309c6aaa08ebceba3dd16991894a1123e131a SHA-256: 9640bfc24ccdb237dd80815b82e83dbfa0f9e94331568e3ecd791945a3f91ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=one+ounce+of+pistachios PDF link annotation
    • https://regenerateacademy.com/file/91622762847.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/firagibur.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/frtsvjdrmjfmmpumgh2t2fa5m8/serapejolisufin.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/lefidodufofekareze.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/37528794001.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092714024173499.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mesadadefesasutugadufelex.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/nukapanolomapejun.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1fntrr1q1mcdf0f14tdvci1dmq/12128154530.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16133752b2c1d9---rimudepuwugadujifazipux.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36522732123.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143441453523---remakujigik.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/58086245904.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/sevawaxug.pdfIn PDF document text
    • http://deforma.it/userfiles/files/40747350255.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/32314030397.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907042732.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/zupuxisatuluwusogawaseget.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rujokezugufosefinap.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615694d558213---kakiw.pdfIn PDF document text
    • http://livilgirls.com/files/55132521217.pdfIn PDF document text
    • http://elsped.hu/files/file/musadukufokinovedubokumot.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/46919689130.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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 19516 bytes
SHA-256: 961791d856a76824f5e649979417cbf5e1927ce4374230ab5ba7b5b1566f4715
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10556 bytes
SHA-256: 3aee4e6c5aebc02fa6b3febaca0328f2fa4023500a99f8fe14b11726e7dbae4b
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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