Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd3ce9616b6d181…

MALICIOUS

PDF

66.6 KB Created: 2021-10-05 19:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae5198af028a9a845b974c597e53c44e SHA-1: 3765e058c2aa97d955024da855696c77f84fc2a1 SHA-256: 2bd3ce9616b6d181eab5f66a2aaa298a47dfcd1a8c1aedb256eaa110914a7851
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm pointing to potentially compromised websites, likely serving as a distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=do+toads+eat+toads PDF link annotation
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/dalanajopelek.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/bezikibabekawudixesexeno.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-24/images/files/viwuninu.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/41989095825.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/femukajupanupalotis.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/gogaxuxafepodalug.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161493cd487dbb---15634566867.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/81058784881.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/namuzoridudufuwanized.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/36197563561.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/rudisa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jhdrb9scph0sjsq33e8l1i6oa9/27964726122.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/pekaduxuwekuxaluv.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142494500c4a---96183584207.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/32387834726.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/27888618941.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/riwepel.pdfIn PDF document text
    • http://timebymtm.com/upload/files/fenekuwokebijusegurivute.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc657ca56---13395163589.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/tadusonagu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1c7b489833667859d9a38eaae66cdb6d/11759799936.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/vobogiwepogikuwixugubibej.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_off0000ac83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC83 14072 bytes
SHA-256: b47bd2f5877dd548f8eb5f2043c2e5a8e697b265d1f810229c1079b7734712b7
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 9900 bytes
SHA-256: c3ceeaa379444ab8c54ed3b595760560a63c505b143f4ce148e9eea1f541379b
font_02_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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