Malicious PDF — malware analysis report

Static analysis result for SHA-256 353a52b0acdb74e0…

MALICIOUS

PDF

93.5 KB Created: 2021-07-25 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1db961e6dd414596ef02594ed19fa02 SHA-1: 9e83e0f0f6479d787971516a1b5ec70db257bf00 SHA-256: 353a52b0acdb74e02dac6782c16a202ab0a39635dba4456d889b60c126d8185d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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 http://allaboutdowney.com/userimages/61858345315.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hku7v1cas5dnl9urie1sdaiadp/64425794814.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2e1e7b2f---fibixunolewevo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/rafedusafataniku.pdfIn PDF document text
    • https://unosms.us/userfiles/file/55089928795.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541624272b---72771144473.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/koraxe.pdfIn PDF document text
    • https://birotex.rs/images/files/40053822430.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/d238j1mo73vj5rntibghgli736/35027728923.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/64901403018.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099c31dcbfdd---80028673910.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wixinedazukewi.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/70794472197.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c779f53a44---73086931926.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa33818c0---34151899161.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160700dd0136be---39626130887.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bivikuliz.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/zadugigapowuli.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/68680076056.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/degitexetutuzabijipi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/duzabidaxojivib.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/532a55ad1fc47fb1d7f3fc31fd62d6da/70622088378.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/19397727361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+a+free+dodge+challengerPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/befiwalugojuluwekufinomak.pdfIn PDF document text
    • 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_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16480 bytes
SHA-256: f11a490bfea0dab90d07bcb597d511468ba5b3a7e95062cd2ab328ab8814b450
font_01_sfnt_off0001378b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378B 10572 bytes
SHA-256: ab12a8ca3aad3cb14e90c0d99d5bdf0d04f1ae96969eee5759982115f312a9b1
font_02_sfnt_off00014f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1