Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd70c97316bb254…

MALICIOUS

PDF

96.8 KB Created: 2021-07-07 03:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c933c07898888f4b3fbacea6a64f9521 SHA-1: 8430d0ec981d094df0dfa25c49902ccebeeb5ece SHA-256: 1bd70c97316bb254648f0f23a8c60eaa74ce45dc476ed447578ed59a4dd2caca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to PDF files hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common malicious document distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://wastran.ru/uplcv?utm_term=thank+you+in+xhosa PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67dd6d50c---rutumevufiru.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/5k53bg8d3jim5oa3tnl8l7k3r5/95465605290.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210514215833981546nn4tor.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/94549937772.pdfIn PDF document text
    • http://korytnica.net/data/files/fukibokazelativuxofolo.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/38624187745.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e0d91481c72a9b120642af782048541e/92076234496.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/mm0vsqoj2sghvmujl40d1fmp52/89948346456.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/sezowipezebekojasut.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2965f0114---97877303285.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a278d7c114b---sijeza.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/947dfb242623431a17ab8970d0990167/74140510555.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gukj910ngc51g68jbfdnlaau1/36043556610.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/litakimejimilozubadok.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9685abfda827148592ec9b23e4e6376d/sasoguluk.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/vefifere.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d73027ec211.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943ab09bb6c---63924749225.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607526f3ae68a---68407288452.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/d676d5dedbb7509d459c0e251185d699/27048300403.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c554369e---65564089571.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/74401943508.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50b9b151a---ropazonefavizox.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4bc4dsr0nl2bc9424150ehektb/64065139296.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_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 17764 bytes
SHA-256: ccd51fbb5421b64e227bafb0571c025f3bbb4fedec99f77f29476cf05be28a83
font_01_sfnt_off0001459b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459B 10200 bytes
SHA-256: 6616f2a52d408dae68b8c1732e683e65aa02b56edc4617c05511cb5d0dde49ea
font_02_sfnt_off00015c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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