Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64f9545026866d3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 20:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8100175b16440e4aa6d3f396a73bcb09 SHA-1: d2b8c50098c7e61a0ed0d853dee8665e93240df8 SHA-256: d64f9545026866d3b0d0b240de6961bc25e360accfcef0371a7278de75dba451
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13711086813.pdf In PDF document text
    • http://www.lalorraineperdue.com/documents/zosozarivezebiv.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/80886998334.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/87429619145.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/sekigefut.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16148937c4ba60---viruro.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/20808468774.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/78269012578.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/33937214219.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15e3a35ed---91368079778.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/56005438155.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/15017530046.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zunusezeduwekin.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9418978804.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/lebuvefevejakono.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/zapukogotoga.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/16925998725.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/zavuperanafepura.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614808bd55e4e---70002957718.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/54530576358.pdfIn PDF document text
    • https://shidoremicrosys.com/media/21680562104.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667420b7ed---tozitebenoza.pdfIn PDF document text
    • https://grandegroup.net/files/47957467236.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613634110fb86---90536730615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mega+apk+mod+premiumPDF 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_off0000b805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB805 10504 bytes
SHA-256: df2c18be40234e5f10a2842fef8e47296694afce59481c1d14a59c98a8b10adf
font_01_sfnt_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 16832 bytes
SHA-256: a5fe9ab10c56ef82d6efa27c455806bece76355706235e56a03d722fbd31ad2d

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