Malicious PDF — malware analysis report

Static analysis result for SHA-256 6109f7c42e93024a…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 03:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ced90c674ad80cbc9ab9d6b404721f19 SHA-1: da29cc50347e31258666160c0242eba6484c4f8e SHA-256: 6109f7c42e93024aec976542dc9b7ae90adb1566df94f7d2eb7d8f1f04d6416b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9905

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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a7u6fb4v1l6jmmdcdemrh0ma75/69972114585.pdf In PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b7028cd8867191b2a73e99f3be90d01c/83039169743.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/70882a1a2b416d7707d4f9b40d65bb70/3635158529.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/34862860150.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/26349832351.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/gigipimoxadivuxogifanal.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/tulesixazoxarefema.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/nojalakobupevozu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102a60fb02---sidarobabopafibabezutamop.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901130858.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef3f85a74---75037128452.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/zilezodovibevukugawe.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/438a2576c67f6271eee848e6c4f2e0c4/firobemi.pdfIn PDF document text
    • http://unsersohn.ch/images/file/13684865918.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/17a9296813ed22c921efb3669c08a264/runimikeselemuwevupir.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/459d745b7e2ef53245451fa900180664/bigefafifalegapulikaja.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gutikunom.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nugowirazaduk.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b34c92eaf34---vafama.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129eebf0daa6---3735639113.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d348e5e331---82006931129.pdfIn PDF document text
    • http://agavietnam.com/img/files/wawis.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/luxuzigatuzivoref.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/63216773263.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca31108f537---27318100652.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae7b1997b4---53767978963.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/24559818887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=firefox+pdf+viewer+invert+colorsPDF 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_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 18004 bytes
SHA-256: 4951b11132222114243e71624685b8e3de265bde7a927a9b17c6d26216b77694
font_01_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10684 bytes
SHA-256: 3350d478cc2234bec6600a5b154333dbb9abb6741e406539efe2a2ef2354fd56
font_02_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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