Malicious PDF — malware analysis report

Static analysis result for SHA-256 33be537fa794df61…

MALICIOUS

PDF

88.6 KB Created: 2021-07-26 08:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8ebd61cf7cef1e3f510937cbf6ef3b1 SHA-1: 6fc1109ee449df932f2a221a7b272c98f0a67f4f SHA-256: 33be537fa794df61828ab800c06b0c8a311f499797dd61aa91ad1048ef4eea28
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e2d2bd0f---42487887761.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0set14sjqcjur1drfdhdsjade5/toxowajurafakewetu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722e6da810---ninajusipipevuj.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/77265383205.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/75412008031.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/46091611052.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060521571373499.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/563c2f0db9af18cb609ba5314a99d8f0/vasilijuxelekires.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/datoji.pdfIn PDF document text
    • http://jaatkinson.com/userimages/netuvuxufovewusadi.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/42906736607.pdfIn PDF document text
    • http://surtek.biz/image/files/20150112_025501.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7df50ad12---2314101824.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pbjoclet30t3geia112k16e4fm/rupex.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/fixerixuworinivinamuva.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/jubami.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3e58c832---84361778355.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace7a0ab95---69582569701.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c72c61437---57170482759.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bazipuzarawakako.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/taparig.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/238803920975fa102fc73ded4e6598c2/bogagajepaxozol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+el+capitan+compatible+with+my+macPDF 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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 10832 bytes
SHA-256: 69392d1aa41c1d8a108b4daf364fdc28c5e2d087719a78ec5e243d5d3e836a07
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 17580 bytes
SHA-256: df3cd29d86688bcaebe0e234632497762fa61d15fe93179fe4c4dabc81c2ef81

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