Malicious PDF — malware analysis report

Static analysis result for SHA-256 108e9f1820e2892a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 14:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cd034c7314317f3cdd9dfe5f36ff740 SHA-1: 234c81d632161bf6d98d425aa69e17d48881c994 SHA-256: 108e9f1820e2892a9cdb8bcfd8ef908e623375b208f0ff36c7c2bde2713a3ef3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=burst+photos+to+gif+android PDF link annotation
    • http://solarwindependence.com/ckfinder/userfiles/files/wejuxajusinaxizolonipi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/64856985887.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/burubefuv.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/gawivizemupolanabe.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/30375595912.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/52293019329.pdfIn PDF document text
    • http://100tmt.com/uploadimage/files/20210905081705.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/tizelow.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/mibevifabuvosofepuna.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/karepitop.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda8fce8f4---tegofa.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nonoman.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/61697618126.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/namujo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a2b9bc4a50---67637627326.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/foruzarezerizif.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131af8ba8d07---41929884919.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/buled.pdfIn PDF document text
    • https://chineseclothingonline.com/File/93831604717.pdfIn PDF document text
    • http://yuli-china.ru/d/files/pagepivuwubumubela.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/rodunewixefezaxowogag.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/80499229381.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/susapezat.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/88785337595.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 18304 bytes
SHA-256: 4fd5b30d3e5179915e0b6f17112818995f8d5bfb822911041b11f8d9bc60f58c
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10752 bytes
SHA-256: cddbfa6adb19da109352b26e6324b38d06727914f8c9bacf4c534f332b998123
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1