Malicious PDF — malware analysis report

Static analysis result for SHA-256 643ade64329ca1e2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 13:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 288c5d003696f9dfe9fcd386e46681ed SHA-1: eec733b068f65c3a749de81a15a26a1d5a3c2215 SHA-256: 643ade64329ca1e2cec5a809837a97768d364ca57b927cafc3438feca246b4df
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to potentially compromised websites, with several heuristics indicating it functions as a link farm on disposable hosting. The primary attack pattern involves directing users to these external sites, likely for further malicious activity such as malware downloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613222f593763---26039262279.pdf In PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/fasakafumebisuv.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s2c7pmstmadceeurb3lpf74r6u/bawilasoporimed.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/97058433044.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/92915902800.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/legidojevisobuv.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/xamovasoxago.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/madifelirov.pdfIn PDF document text
    • http://wamer.org/userfiles/file/toxopemorafojeni.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/91376320876.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/64608130026.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161365fe19a7c1---lunopuvadejodeb.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7e54480f936f188d302c8a54dba1c410/68704737930.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/94269830160.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/gizulowuzotufefupunixilut.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/pexisefujeda.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/24064112263.pdfIn PDF document text
    • https://norservis.cz/files/files/vuxivavefizifum.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/gaxurikikofuvonuze.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161363b260a00e---wepinugogunuz.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210903_065632.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/gaxisejejuw.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161513ff14483e---15606893911.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/12201457556.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/27603895433.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/17540533007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+broadcast+on+messengerPDF 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_off0000b52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52D 17928 bytes
SHA-256: ac38b99d28ab5d795820c12b66fe6f5ca3ab79316b3c0ee819859bc231e3d605
font_01_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 10792 bytes
SHA-256: 73043599beadf8e3b81ef7b4be22276c02973297bc3feef5135698a6b7183478
font_02_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.