Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec17d8a9739aa52…

MALICIOUS

PDF

91.8 KB Created: 2021-08-08 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71b9737ebab4b9402aa76f633587bc07 SHA-1: 14a84515c4a15fefc9e3466c166e941646a7ac0e SHA-256: cec17d8a9739aa52b1e4c5bf71afac53ff88848fc1b9fc210fc960c095a71fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://allytemp.ru/uplcv?utm_term=bubble+witch+saga+2+levels+with+bubble+wheels PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8464ebed---lejekikelukuf.pdfIn PDF document text
    • http://dsagco.com/Upload/file/80859260331.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2e61dc24---59953753654.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f09dc1b85cb---pokopuzuza.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/70120753368.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/diparugagurivajidex.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16270261266842.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b24c73991---pijogubufofapirolonofa.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamafanonorirukemamozazi.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/58462150048.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/limubakaxiwe.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/898a8834b36642ad70641f152e02f7ba/47473108976.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070411173851.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/672e6b2930db7df789d1960ab1bd6cba/zewejabazibesarisij.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/sudofeto.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c642b5d217---3821378694.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23561a0fd4---pesaxeguwidumoronilolabas.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kulepumawasimewiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tudedapafefafenur.pdfIn PDF document text
    • http://klhl.com/userfiles/file/manorirufew.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/00476adada15d56b510169a90063cf7c/vunapivatexotikazolidoxe.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/39552995796.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75f6c9385---78572383350.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nozesasidebatedimik.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_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 16920 bytes
SHA-256: f794b9d68c36148f21e0878b629dd2c78800b592a9585a1e542c73365756a831
font_01_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147ED 10748 bytes
SHA-256: b9b9457af123f841f4453c43bf0986c21992f8272067240288507fb94e8ea0a0

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