Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1019449e0081793…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 10:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fddc3d9375ab84e41e594e2688a1033e SHA-1: e263d122d444cc6510c57de511eb54fb3f83889e SHA-256: c1019449e0081793e215e135a400afa5a77471f31b1da42701829eb3d267a958
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated, preventing analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=whatsapp+android+tablet+wifi+only PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b580adab99---muzopizafexujaga.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/73704286653.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/26884482093.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91840385669.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/tidijimikuju.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zowakekekad.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908182358179.pdfIn PDF document text
    • http://weldingplaza.com/files/file/lonedezemaju.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/24975875244.pdfIn PDF document text
    • http://fourfoods.com/images/files/11513035285.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459d22270cc---22737306151.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/47709455999.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/betumegifuwesir.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/25231895682.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a59cda31---57842936748.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210923161615.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/75302126401.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/20219238104450.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/3797983091.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/27041349400.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/88510686058.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/14050973111.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/jorurog.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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 17616 bytes
SHA-256: 78f0985b0ec467e7106d038e76da69b40d59d6c4483d7d627d31871276363365
font_02_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 10928 bytes
SHA-256: bef2a9031d56ad2d401c33b9497330b8de3f786189d75d74c91d7c4104e0278c