Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef79057d595272d…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 13:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc622b1d5cadd1e30adb50138e601479 SHA-1: a1c20b4beedb32fc425de6cbf299c1b12d4cf48e SHA-256: eef79057d595272d1989b011bd13362b7cc999f5cc68d487f2de5bd16cff444c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/q724q53taeeqgq5cjcc73gcfq9/97006468898.pdf In PDF document text
    • http://szguilong.com/userfiles/files/42980214875.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/24193730357.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b272466a---vedukexux.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c9981ab2---24849462962.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80153788745.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/kagalesojepafejoxe.pdfIn PDF document text
    • http://alptw.com/images/files/penezesuz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c0e6f4370a4abd3ef6de511c8398b7c2/27166508786.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/revotijuxiwagere.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/76921198942.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5f641594---20949370260.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/gubibuvidefuduzimi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/sanatiti.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/wumeriruzikeditiwepedul.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/42640142037.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cd1c992a6---76700120608.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/navepufiteda.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28246e2b4a---94960437746.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/99466353280.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0ed031e69---xuluxazani.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nijasefiragupijis.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vojupedaginejofonegevi.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/90369713353.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314941b1b6f---najavujuwosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mariano+azuela+biografia+pdfPDF 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_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10700 bytes
SHA-256: be6ec5277aed3ecc0c3a21ce8584d86dc96984520c9799b52503479ac0866995
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 18940 bytes
SHA-256: e49c1368cddce11bc1db28f49a47b244afd9ea4413b1a1f1e96f25545487005a