Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cd5a366092bf9c…

MALICIOUS

PDF

94.5 KB Created: 2021-08-09 06:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6654ed7c2607fd59d0589d86bbe3c244 SHA-1: e2b2ae79ded75437937271bb976843bc13a49c24 SHA-256: 09cd5a366092bf9c580ceef17a35b52a702e8868d2c72ca6237fe217b31c391f
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which host further PDF files, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic and a high ML score further indicate malicious intent. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/22j9v54dro70a5tvs02gcoo5k3/getom.pdf In PDF document text
    • http://amandamaitland.com/images/file/wexazekidot.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/831sfnqa0a3ofrvagm4koro56v/datow.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24bc54539---73637366142.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9efbbe1c---fudapat.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/lanadezupaka.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/9798946793.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c7fde7f23d868a9f2e15fac5731bb8c9/fogejituvapogibiwazop.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626123061.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/42255870069.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tuwivog.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/wefudi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/44408730740.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a11916d1611---pakivonatejovokazebiroleg.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a6c9a57bbda99cd69297a081ed291151/paniforox.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d3612e0---pebimupilevubopinozakupap.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f658d7f2---fuvezovosuso.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5e493ad9d7b6f3e799bcf15bf3e9fc3f/65564433013.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/73322140246.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982f0742b2b---mufonalelevewanaboferok.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/28578628804.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/69655125545.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/65370044393.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9138e42b66---86611476232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bully+anniversary+edition+download+netblogPDF 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_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10980 bytes
SHA-256: 4722d56d0af041cad8e4f0539fb1c6434bb0b429bddd32f89830ba4537b04a25
font_01_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 17580 bytes
SHA-256: 29e265e59329423b12ab0d73870e0c332069991c73b0f390906109fa3822a165
font_02_sfnt_off0001529e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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