Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb6d721db849b85…

MALICIOUS

PDF

101.9 KB Created: 2021-07-01 14:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c52d240c640acbd0f954e029ff85fb0 SHA-1: dd16d48cb96d9da202404916741ed1777eb17bb2 SHA-256: 6fb6d721db849b8542ffb4e5ccc30766af675c78eed7bd4dab73e22d8d0166c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • 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.
  • 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://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b60d85cea3f5167112b09fb09b88870b/pisiredibuzawi.pdf In PDF document text
    • http://industrialdevices.in/uploads/lugemenuposufebulil.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/bexewuxalolixitibudirazid.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/52e58a3c4c59456f99a073052364c216/votenibijasivemulir.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/67663018358.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/98c9084179ee90b9addcc547baaed205/74808713300.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609607aa945b8---50471807350.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nan5c89qn94sd16hf2gnip9iof/15208103817.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6sqc2i54i9v63jv2s0e74t7vc/38068198123.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8s0jidj6r933rnhlocm6pqj7a1/kuwefepajesibefa.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pedudiburi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/rimijap.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/nimirivoxaji.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gtvqeigfgg7smrccjjaqelgog5/22479319580.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/p5nmst49436v39thefsm7qtuve/29251429485.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ffe02aa98---kuzerelobobarifolu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/9870543867.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b5753aff0cbac2517de2b4ec78e35d09/farasawiruv.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/vojuronal.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/96826259460.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071860ae384f---85167891251.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kividexabonakirotanufa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089011577f6c---47385959995.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/75811167406.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/82e7e8064cd61ec171a5852104619ac2/42954195460.pdfIn PDF document text
    • http://recrute.fr/files/files/29645061442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=counselling+in+different+settings+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_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 10644 bytes
SHA-256: 23c62aebf4fe86d9f5cd85365daa50a1c2cfa29c443cd94789ca5ee40fc8b961
font_01_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 19600 bytes
SHA-256: db69de1e5643b78a7662e3ab51e8dfe328485d61c4b38ee41214b4cd2f10af2d
font_02_sfnt_off00017323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1