Malicious PDF — malware analysis report

Static analysis result for SHA-256 529979de59858b24…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 14:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 13cb7800f695b314e2f237a5bca96896 SHA-1: 23098808a0844c56e3f3ec406348ad675a11ea16 SHA-256: 529979de59858b248eb890d2ef894e8357f679099d1f0072441c32d43008b85d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dishandspoonproductions.com/ckfinder/userfiles/files/beguzafilakonevofopogagun.pdf In PDF document text
    • https://ever.dacola.com/upload/files/xasat.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/56f829d1f2303c9f28d1720abfd1a59c/20327879715.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/45283239036.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/57736641604.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf931ca20---zepuvexuzevasarizegigim.pdfIn PDF document text
    • https://jensbrode.de/files/file/52944627127.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/gimeselapalovogurorupuduz.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/4919856362.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/93067723009.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/48914123987.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/tiwalos.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/26075182887.pdfIn PDF document text
    • http://metallpress.info/files/6406796503.pdfIn PDF document text
    • http://sbairs.com/datas/files/jiwapenuxakazakotafepoba.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/35916951662.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nepodinozu.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/godedufefakab.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/34399686442.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hm8jhrsgtj4m6esefihs5ktgov/xepuzoj.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/52067397799.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/92172037653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+offline+shooting+gamesPDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 17060 bytes
SHA-256: 4bf3f61488e351a58b6cb9f8533c47049f0cb407397ccdcb68835ad8ca58594f
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10612 bytes
SHA-256: 548975ea8c0ed98a6bf76a00c38efb861fff07d90735d8b94b6d82fb8ce878bd
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1