Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbfad23a7ad2ffd…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 06:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36ac3531dea0a02194f41fe3643ce213 SHA-1: c1f3b156cd8aa41e9848bb1ca32d7413868d3048 SHA-256: 1cbfad23a7ad2ffd3c1d21dbf05ef9d89825628607f4466867d288c1c249b451
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be social engineering through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6c023ef5---wudebuvepaza.pdf In PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6e7696635358129284902a6030794851/gefuju.pdfIn PDF document text
    • https://bio86.net/fichiers/418833762.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/76766849386.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/7266077087.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8ce70fc9---xeriza.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/32541953038.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/jubuxomalet.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kogopinoganuzutulesova.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/83088890660.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xesabevu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/95309780172.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5f112ff67939f688d66daf0d7148930a/pexub.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a7978c102---60675198458.pdfIn PDF document text
    • https://kawanmto.info/contents/files/85942572733.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/44313051569.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/nifibulofomikitetapi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee104375ef---20544788032.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/1461097261.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/fukemedavaxitiravopedodim.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/db26945d6edd313432a589a1e5a8684f/zegokoki.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/42561004140.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/rorexetinadefoduwipobama.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/89230188064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=calculate+the+percent+composition+by+massPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 18476 bytes
SHA-256: db531df8a78291de19f0b9568ad3e2b5796d925f5690a1d6f5eb08bff68e394b
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 11024 bytes
SHA-256: fce5f591905dcbe1d31e795e529d706127c5c7377805c967421e47a13d602ade

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