Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff24da0763d8a0b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 20:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1e53260f66728a1dd719f9137f50371 SHA-1: 114bdecdde96f55996bbbff155777f224471c0f5 SHA-256: 1ff24da0763d8a0be746c750ed2ad2c24503ae197bcde6b8815ca742fa4799a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=birds+of+prey+of+the+indian+subcontinent+pdf PDF link annotation
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_072801.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/59458093688.pdfIn PDF document text
    • https://linker.tw/files/pitelumejitimoxi.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/rikowinukotexo.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/kimefapabaviwolare.pdfIn PDF document text
    • https://istanajp.com/contents/files/38430653656.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/tezusanabikomaturupo.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/39317707278.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613acd1326b86---833883516.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/nadugoz.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kezawifu.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/49515132544.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/40302926851.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/33517078080.pdfIn PDF document text
    • http://stromzeleny.cz/file/65032528345.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5696aadbd9b5a1a825aa007b65c5a20e/satusufadokoweberi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ee9825ead47a231fe15f092d3a49b13d/77553390412.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/88192018066.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ba059e943cc499b8f2d3d5b6871fece/gurugisekojevew.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/xerofunek.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/15120377510.pdfIn PDF document text
    • http://goldia.cz/data/file/tojubesavelo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fokizujorugadinaxiluraku.pdfIn PDF document text
    • http://aweibel.com/Photo/file/94456288614.pdfIn PDF document text
    • 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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16796 bytes
SHA-256: cd25442d23b61c2106b59c1850d74d077c55b566895ddd15bb9a54f5391ca8d9
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 11076 bytes
SHA-256: 961fb205bddbe3f9dcb7b5f6383d7ab4a1b5a0db56ada5a2d6605cea829a21aa