Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67bc016af72720f…

MALICIOUS

PDF

87.2 KB Created: 2021-09-11 02:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74906337b4e599110d3b69b7833e734c SHA-1: ca435ec695242383b49b13d62dfa4762fb94418d SHA-256: b67bc016af72720f05600cc924737d27fd2a70c60fc167f69e699b4f40b3ef3b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate initial access through user interaction with malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hijaustabilo.com/contents/files/48967476443.pdf In PDF document text
    • https://grupa-energia.pl/attachments/file/sigomololuvop.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/24449846973.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/93343692915.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6e4aeb7f---kefemu.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/63834128792.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320d9092271---94980399968.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/99587751513.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/66513015891.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/78481266386.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a169907b53---zidupevivig.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/bepatolulopupijav.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/96491233717.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/fagivaxaveja.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/pogibofumurolif.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32073140b---86015790318.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/negoxul.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/gadudol.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/zuxawapiwabuxo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/55327282660.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kepimeweguzuwifegapikom.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/3374922640.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9a3e149e---87469735372.pdfIn PDF document text
    • https://peterdegendt.be/file/jiwomunitujevibebuvaba.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/modelixuresiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=donkey+kong+game+androidPDF 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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16960 bytes
SHA-256: 97205b645c84c596196e3da8f91f08a455ff7c110ae4ce46877a76e917bc4e74
font_01_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 10488 bytes
SHA-256: a04c3f830fec18589aa5348293a634f6a60ce647a3333aa8ec86b0b38ad0c9d1
font_02_sfnt_off0001374e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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