Malicious PDF — malware analysis report

Static analysis result for SHA-256 209b01fdc965a909…

MALICIOUS

PDF

73.6 KB Created: 2021-08-31 21:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4c029479be401a8426de38f95e342390 SHA-1: 3641df8e47e268dc9da89b4742403b66fde84f6c SHA-256: 209b01fdc965a909bbc5d98855688747fdd7ceedef6ea383448bbb5123fe9ac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://crosswaysrecruitment.com/userfiles/file/60636436177.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wedejakikomiselupodix.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/10b9a7970f4f5d2f61c7212e9e78a4ae/fiwikojidemevipit.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/fesiz.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2703850fa---6596860446.pdfIn PDF document text
    • https://limsurdua.com/contents/files/fefuwopedakadifupasejodev.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/p2g6vd9sqtod85dhbk01iivm5c/76597213158.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/virixokalulorikufukedu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad053a138---41792437779.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b8266f89---951805905.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dufozisenaj.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/visogirumoxidetasupajas.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/zejenarimurupebipox.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/18582843245.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/puxunizugusu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/devimenusitunam.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125300063e9b---34690072491.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c4be7a7b25dfe529da4c4757bff8f21a/55218692453.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/jatipajiwirok.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/12e3d55826a7cf4f1cb8311a12a734fc/voginosozuju.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96127635819.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/remikegez.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/18146068682.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rcdcb6k3gadlrdfmj1b62e4ri3/wesumagevoratike.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b10476c2bef---81574078175.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb44228e66e---10408690693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=grayed+out+meaning+in+teluguPDF 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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 10676 bytes
SHA-256: 0c67fb9c558c0a7446aef836576ac35554af7a37d52187d68ae67d831fd37b31
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 17424 bytes
SHA-256: 4b4c574de09e1eb1d84522a1b9a8c6e09ca2173e869a5e23d84b753ef0364649
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1