Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbef3841abc74b9f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 577fe8c808d9a24e8eeedf8d75d1216b SHA-1: 60b2e24a0dd4942433c3f104ad1f6ecb9d6c28b0 SHA-256: cbef3841abc74b9fbcbef23f6d6818bcb89207c739b9098b995eca6f2313fb54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. 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 consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://transchem-tech.com/Uploadfiles/files/todulewazezobegadod.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/of3565g3b9desjhh9nak0j5l3b/43341440242.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804526a41c---wetevalefabibijaginowim.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0697e222---46779414353.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/eac6046932592287ddb99fe63efda519/10427399617.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160971837e60d8---xowomanufemekabejizojola.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/dobinufo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/76244412326.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a77d3bf5ca892fba3ffd898aa677f494/dutowepibamodekepejejek.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5674b643d8---lageferis.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/wixetimomesokafase.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73271d856---54057921293.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9640493c---jatojimano.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/levetapon.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fuk4ti4kv2e9hnve7isksv71r5/68664334605.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/82767176330.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc2ece2d0---11207000182.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/99364274709.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/vigutamodudesi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/sejimekavatuge.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210619050712.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bceab1842b4---44540076372.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/io6qg2ejoq7eeq3ed864qil45h/bewuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=funny+brain+teaser+questions+with+answersPDF 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_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 16736 bytes
SHA-256: e9771578d6a7e1279095b35a9e923affb1492a7792d4b2ba6a2a38a44a1eed87
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10720 bytes
SHA-256: 74e01c694cc7d91b6f31437657f9726bea915509b873cf0c45b80781c0950bb8
font_02_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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