Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd18cf24317131c…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 09:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 238209eb18fdf158f547aee945d323d4 SHA-1: 5269e6408b8a20194f6f90e2a89172797136fd89 SHA-256: afd18cf24317131c22a37f73d65708fcb25d66c88ff19350ef658002c495fca3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/45412564b729ab3dc63ebba5157e57e1/logobarisivokupimuk.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c81c9af8a---87990047230.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/bolitimakelirigerumu.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/tajibefug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda84a99d85---zunesopuk.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ft4v0rb6vimtuaj3eb6em8cg8c/detiwofozogirenuraje.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/94698975835.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/10395824991.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161074e5332599---fepobewumutikazapape.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d476031f---47601959017.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/29471700438.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4880c4cb3a---xameparegofovot.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/suvivowuvuwuraveg.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/m586ecctellp95kvd2s2jamtal/gimivanivi.pdfIn PDF document text
    • http://texmet.pl/userimages/file/98922425029.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/dimaxiduwasipase.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/41315161227.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/34d9usdu1d6qj7h4g319cmf1l6/wonuzawarobopujobupevav.pdfIn PDF document text
    • https://rcot.org/userfiles/file/vunenenebakibazidadag.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nowesivewomo.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/78555587820.pdfIn PDF document text
    • http://allycatering.com/userfiles/19564812334.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dapeleremidid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=atividades+com+tirinhas+sobre+ora%C3%A7%C3%B5es+subordinadas+adverbiaisPDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 19504 bytes
SHA-256: 022f6f3c1a5176f12cc1c3b54d07fc672eb10805f4c030443991886e4d548230
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 11300 bytes
SHA-256: 5103673f71f0897133973e715b28b4c977a77e79b3c3c5b97fa7a674c4c9478c
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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