Malicious PDF — malware analysis report

Static analysis result for SHA-256 e134dd4ff8ad6eec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 14:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03366f9eb890d08660a8c4fe60733b18 SHA-1: ed843a145570841571594a9c34076b08f3e49ec1 SHA-256: e134dd4ff8ad6eec29623dfc0629d8bc68b82143fd3a10c519d00419bb457969
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, some of which point to compromised WordPress sites and link farms. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of further malicious code or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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://gardenofsound.com/userfiles/files/limoxosesobagewig.pdf In PDF document text
    • http://laureysnv.be/uploads/files/rugelimuk.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/66518594767.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614159eadd9e7---bubanogunekuwadinatozu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5lgcv4e5phsfakd5b3558isepq/71992665469.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/keked.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d43f7ea4a---3460499505.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/87162121119.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/22353327016.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zunezovitokobebi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144568860111---luwudibixi.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/robovuvimedavunoduremume.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f31d3b2f52ff209214cdf63dba9393dc/guveruvezikixoxusekalolur.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/82383493000.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/vanitonugopu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e307be5a1b---fituda.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/79503436859.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090909473673499.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fumisokedu.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c0a580ea7---92941945335.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/74206243939.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/4929561816142b37ccf213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chrome+android+open+pdf+in+browserPDF 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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 18544 bytes
SHA-256: 5bfb19b5f2ae5f459b08c20e9aec7f3e9845acf086867a5e0bc1e8384b38d6a5
font_02_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 10876 bytes
SHA-256: e5e64d049098053c4a7dd978a799ff08461f31ba5a8a81fc7d697f232c155efe

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