Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c9667504277243…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 17:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a62e7f7b917f85b02e344d503289daa SHA-1: ac07672e4107e8edd11a03eef48b367cd9249f5e SHA-256: 78c966750427724383e21168f82d06a10e3c41e728b83e1bd75e5a3848b7836d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML flagging strongly suggests malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6bf01uetvv24kb1g36gti71rl8/bovafekabixul.pdf In PDF document text
    • http://mylodge-naoshima.com/mazapal.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/sp76resncudp8or246p9v4k4of/lesik.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae30664aa---84860813155.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/niguvarokofob.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0bc330253b506c728e2bb9b06ed2e393/50914877603.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/namirusizevuduwuzojasuwer.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/30700929817.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0882d0e38---31044913271.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/savofatonalibixizegexuba.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/79678184403.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160991d29c7f13---gajomatuwuxufunokelo.pdfIn PDF document text
    • https://asiapharma.la/files/files/78910063913.pdfIn PDF document text
    • https://clubon.top/uploads/files/66563907157.pdfIn PDF document text
    • http://arslanemlak.com/E/file/mutegujuvogimo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jodixifololifenisiw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af81a3e5f83---45563248758.pdfIn PDF document text
    • http://billsky.ee/files/file/vovusewofaxosalonutosozi.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/samewuzavatogiruwija.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/40681087913.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/48552010942.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/kadimokoxodufesafebodi.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nagawumotawez.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/tupitaxumawurogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lsat+practice+test+pdf+downloadPDF 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_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 10656 bytes
SHA-256: b503e34f92b85eea25a34f54cf79b9ff6e6660016e732cbf758e12431fceff80
font_02_sfnt_off000139c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C5 18812 bytes
SHA-256: e5cafe9ead1c24c023704b2d66c28955e182537370eb051365bd22ad6118860b