Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c06f3b1d45e30e…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 03:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55478d7660f50e7222de6a111ba4ecf7 SHA-1: 14f30dacf3410fc92f3030f1721b21efbe8be294 SHA-256: a3c06f3b1d45e30e1187fbd68c511bf2acb7c87dc0c5c8cda50b7ef7c93795ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ccb7cf64ec7a1537a7132903e563b4a9/43473588222.pdf In PDF document text
    • http://wenxuezj.com/images/File/labuxasazevavitefe.pdfIn PDF document text
    • https://bursac.net/userfiles/file/sojekole.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/uoajvj0hqe6muvp82v7p1f8890/mabuk.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/rorov.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11a07f4b2---46379161473.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/29809351084.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/95433932579.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/43578035357.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/sodami.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e412168c7---fenotutu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/27225327902.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/namotijodibi.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/90224605030.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/zagobupewifubitiguwipik.pdfIn PDF document text
    • http://saglikligencler.org/files/files/45182604030.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/50088727107.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110783459f39---88157854383.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b22115ac1e5bee77e98d09aa736b856/weratasonibomib.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zalam.pdfIn PDF document text
    • https://maturana.cl/upload/file/toxuzexo.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/97187822943.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dfd8d219c0557e94b422374c5c018364/58574189837.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/52964318995.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bofuwuvifanotawevaf.pdfIn PDF document text
    • https://securitydm.com/slicice/file/18768007723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dangal+full+movie+download+720p+mp4moviezPDF 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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 17056 bytes
SHA-256: efda12fe422b4d22a5c6a300a8a65f6efcd7640720d705c03085d73e0cec82c0
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 11160 bytes
SHA-256: 7ed540dc45b054b1cad33ef479fbfb5294c7e0386d0c837b5f4d5525a7c17c23

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