Malicious PDF — malware analysis report

Static analysis result for SHA-256 8243b5a81185ba61…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 14:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79e5a8259adff358bb6d9ea86379789b SHA-1: 7d35ce9346aca73a5cbc372c76d788a7a0048622 SHA-256: 8243b5a81185ba61c9be677e3348afd83e5783525b607f99e3fdcceafa49de3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://harekatmemuru.com/images/Media/files/tukevopikopuxakazuparu.pdf In PDF document text
    • http://hanart21.com/files/userfiles/file/xajozemunalulixu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ngeoisjntmmt5s5730vkh9p0l9/47713843319.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/zukabinorixukosoxuz.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/sijupelusig.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/86601463026.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/nikuk.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a9a3ac2c83b9af95d7696bf5ca1fad2/89939084362.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jiwotakomuwemamusakunib.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444ce022f98---kamesebogorineg.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/96824551586.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614500348524a---gusigatosewekesi.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/32566968688.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/9131173639.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/9993663664.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/bipak.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/45138602047.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/wuzuvupotalob.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83672037211.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/85329165527.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/katefulufexufilekasi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e75ec67f7---29885959268.pdfIn PDF document text
    • http://szm.hu/userfiles/file/51142272127.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/57010142198.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/35727916454.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/95683292630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=transfer+wifi+passwords+to+new+phonePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530d9eb1bf---43807103794.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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 10600 bytes
SHA-256: 7b58ec5467d1e044046becbb9d52160fccbd53d8c90701ba2a9b9486e7c963ee
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 17980 bytes
SHA-256: 2f66a938de9a2f55c47f4122658373e31be73a74db85baa24b7e5b5a2e6790a4
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1