Malicious PDF — malware analysis report

Static analysis result for SHA-256 b180a9dda031140c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 13:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7375c5d31d53508f39bc0fdf02c699ec SHA-1: da039ab313a5f38fe9d1fe5504681f7dacc76796 SHA-256: b180a9dda031140c3a15d0b214e9930337125825f39799db142a478836851498
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfda95b734f734e461eb16ea86363259/xagupit.pdf In PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/42294488082.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gpdbe6fe15caftd80842jbmu5q/tabawabenutogopojolodud.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f786fd68f67636fdd8f650cd9c5e080e/41607921148.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/90954685163.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/puvoza.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/43780698503.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c165913d6---ximikadonepe.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/fepajeri.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/uleq2tssbibr3d5gdh9bghlsc8/nigidinesoxidorosijofok.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/pivuzaxigixedonasaluzunax.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/26388923088.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/voluwuzeriwemomuzakelemem.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/bugajakilanopekamo.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/63471549524.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ee3673fb699a6ef6c54edbb066ba1cc0/parex.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/59344243661.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/zozesamewubezagolalal.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/mobereji.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf662122c---8019359079.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a29606495d5e376a2d382544cce914a7/15547750005.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e4556bad---xojibitetam.pdfIn PDF document text
    • http://citra.cl/userfiles/file/madukugup.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2298765c---pizutubavokezajer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=foundation+of+computer+science+fourth+edition+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10916 bytes
SHA-256: 55b85c4b4cece21f92d49f35b8f3c7615baed082020940841c2743dcc3fd6008
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 17440 bytes
SHA-256: 5ce1b90c51d623ad5d0c1c50dddf0575ef8370192c9b0560d101657c3d911791
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1