Malicious PDF — malware analysis report

Static analysis result for SHA-256 17001171e5243343…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 17:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54c5b6e950e0146560901435149f46c4 SHA-1: 8b90a7fd1688106199327fae6cbdf8d5625db38c SHA-256: 17001171e5243343091ff63d95ea8ab343493699b7293bef9aa95321e2e0485b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a69aa89c---zobolitaxux.pdf In PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/37705349363.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/66pvec0cf81mlpur3knmpcj2n2/xifuwetikugadujopipezuma.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/gemafizuzeta.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210827063327.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/wasuzip.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430021958516131.pdfIn PDF document text
    • https://geniodelweb.com/file/92560998730.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/wolejaxinawizemog.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ef56c650ed55038c2688fa2a4bb7a28b/73102986306.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jelorofu.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/pogidudiz.pdfIn PDF document text
    • http://builderall.info/userfiles/file/fuperaxumisotasaba.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/zutexaxirevomovimaz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fd99d676---56128442214.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4637ab7669---zebasigemeriwika.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/vujobaririfegumad.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63648829889.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/mibivexeruzogosekazisili.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/198bbf65b1300f1146a0924168fe9730/6000141817.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/luvedinivofet.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/923af29584ee119486628048bad5bd07/lefedajegidek.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/mubus.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/87917235550.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/95486657404.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094440412923---kobigotetutogimedawuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2006+chrysler+300c+owners+manual+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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 11480 bytes
SHA-256: 9862d8f67e8a86fb80e8a758da3f8d44dfc0d4a1a768ebe90e8eb292aa62f423
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 18076 bytes
SHA-256: 91fc0e3ec499afc98f07dad4233c0b77aa7e1e9256d33a73356d014ae2715522
font_02_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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