Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b62e6498eaccfbb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17ea3f7b189089e3c510942fee7ea5b7 SHA-1: fbf4410fca9068fd5cc4adc95c10cb9b4451de59 SHA-256: 8b62e6498eaccfbbfac721ec23e324f7e2d6a8ec29b0b24e1ae034534239c9d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress uploads. The embedded URLs, particularly those related to 'formcraft' and 'file-upload' plugins, suggest an attempt to host malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed90b56ea8---41133846145.pdf In PDF document text
    • https://cottonweb.net/userfiles/file/98524013096.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/73669108425.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/levejizunop.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/59133898811.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1l7otm7mb36nok85tls06hl67k/2192131122.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/sotuzo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611615b34a6e4---babiwalaguw.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/76418324632.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ad3db8ab20bc9e5c7718f77aff43af5a/63509322057.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eed3ebb2b22d93a8e1dbdab23c4fbaa1/10770634728.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/11636468877.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/nurubafe.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/jikulujiwajatubejij.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/66103184244.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/varafunibotagegax.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4tgbtjoobtj4pl443fqk5lo8cu/87656231787.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/milamoxego.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/52pc1o47ik9l2epg6iebtkb2r2/parevugesulafuje.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba7fc5dcd---rofokegemos.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210616/file/juguw.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/migedezaxiv.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4m9k2ocagf7a2t4b1jtlhb5ejv/rititag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=8th+grade+math+quiz+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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 10924 bytes
SHA-256: e41c3c18ef676fbb4706c1daf0f083e184479cf3e251719f562c80a3bd804e29
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 18000 bytes
SHA-256: 2e55a132ad4c6ec5ba5acaec7a80765d934a133233842fc588da53810aca96e7

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