Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8e312976215f40…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 14:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49b202088548fb70272e477beb7b604d SHA-1: 812d17620663902815d83be537632cf7d98fb869 SHA-256: 0a8e312976215f4047b38ea644338cae3bae308142758f3913411fd8c2a4cf61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://inwebjor.ru/uplcv?utm_term=app+editor+mod+apk PDF link annotation
    • http://cobmedia.hu/include/70514368643.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210918001355.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/15893171586145cb872352a.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/jekosodikalufuzegisewepaw.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e85d8dd8---rojepapuma.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1885c25f---54962582127.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/lamaxapixagotanine.pdfIn PDF document text
    • https://motecx.com/images/file/vuwifesasoned.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/lawago.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/71278767503.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d2fec78bde9c500fc44607eaf25ea19/pulolorogofapobolox.pdfIn PDF document text
    • http://briztravel.com/upload/files/91114749460.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/mobosetetudep.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/39593864380.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/64639538295.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/towasimudilivowonipusiz.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/46929618975.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/53727026050.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/topunudugu.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/ripugezufukugenezizifo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/paxux.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/sajilizeso.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/moxamutiretizid.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 22592 bytes
SHA-256: 75b9932393b31b54ee6e93f842f073ed540fa6b2bb19dc6ecf897ee21253de34
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 10308 bytes
SHA-256: 7337d596982e80675a2db3d7c6814af2e673212317fd55a9837b1e9353566957

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