Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb38554290095c7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 14:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fea318f9003a7356e6986c91efe62f5 SHA-1: 1fb510a8f275822a18d2723ac89a778610c15d1f SHA-256: ebb38554290095c74cb57d1833f3d80af3ebb383bc86e9f228e0d4bb3e1de839
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=android+10+move+apps+to+sd+card PDF link annotation
    • http://halanmilk.com/upload/files/5108742367.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/degiwuxuloj.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/25963228239.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r7jrt4ggrqislp376jfji8pcfo/watapifapaziba.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/perokefawivozofugifut.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pobelogisipepukoj.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/78202967040.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161303fcb94815---wadonewutip.pdfIn PDF document text
    • https://clinicscrm.com/img/files/banobex.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/99119745665.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fazitetipe.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/13122332346.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/40784796208.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210907_062144.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd014f38c---75617716658.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/91028638771.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/48874603942.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/xajubodeze.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vloc37638431dpuju7h7m30pk7/segapata.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/rurixudotevovemaze.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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 17864 bytes
SHA-256: d997f68d709b3dd818b6188e80f34f87be913e25698cdb49ee38f73333226ee3
font_01_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 10852 bytes
SHA-256: a59d38571cfe187e21bda66153fba432448d168a21582bf0d2f0efda52cb76da