Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d1d7719491a24a…

MALICIOUS

PDF

91.1 KB Created: 2021-07-18 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64f64a96f2d27a5eded687bb0cbb00be SHA-1: dcfa80ebf61361e5a441f3b12c9292a4c46bdc15 SHA-256: 89d1d7719491a24a5085b989d0ab6191bc0300fc6c568c56b2e4adb5a9fde903
196 Risk Score

Malware Insights

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

The PDF document contains a lure to install a browser extension or update, a common social-engineering tactic. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fjfniag172a5q5sk3msrdn109/muxefowiberalagunifulapen.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b698d20e9e---gumowesetugasidekazofup.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/60250347800.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/82112556679.pdfIn PDF document text
    • http://redactron.com/userfiles/file/37464041426.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zesikefazokok.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/j05vlp91g1su8s5r0lirvrmhmh/54986596879.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93251cabd---1142425148.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/27516647682.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8e9f9006a0e04481119e789cc7e66ad2/kajonofaseze.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/23098553926.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/warumolad.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/me15c89l41e0sdlsosdoemvk50/logobajeredijiniwuxitil.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb3446803---44686147329.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/lajafutububulizejokunegix.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/94697923477.pdfIn PDF document text
    • http://jaika.in/images/documents/files/kukonidunixibimipo.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/42547477432.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753ae43d9fe---95863704793.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16081173453b81---94882739651.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/60482174618.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/funafasagumepib.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/75459898330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gtd+outlook+onenotePDF 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_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 9948 bytes
SHA-256: cba68a25c63a9d08d19f9832f430ef2036b8626c3549c78608df1ccc8d53b07f
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 17624 bytes
SHA-256: 3f3e216a480ae2291f446075ff0cbb60b99ff6ac604e3eccceebf991007d7eb2

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