Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbf4bcca779ea5b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 02:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8fa00233441eb4601aba16abeb9754c SHA-1: b4e81b62f546295b64ef9678b8c6179a919d3f7f SHA-256: 6cbf4bcca779ea5b9221ddd23e0b6460030886b95c4c8d1bf6b83463be39704b
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering by presenting a lure to install a browser extension or update. This is a common tactic to trick users into executing malicious code or providing credentials. The presence of multiple links to potentially compromised or disposable hosting sites, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to facilitate the download and execution of a secondary payload, likely leveraging JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://smm-mm.com/uploads/news_file/mokizopive.pdf In PDF document text
    • http://lawyergz.net/uploadfile/files/86622636990.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1292fc03---mezedobubimi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/niwurofufomumok.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/ruwuxenabirexa.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/12365466253.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/25142875628.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/78766407788.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vupogejesajuvefidenet.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/96553940071.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613739bec060b---23847457458.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/47484307821.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/legoliladizi.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/49355231281.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/33287384612.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/50270078817.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/ririxivuwexegopo.pdfIn PDF document text
    • http://armanetti.com/images/36359551916.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/41176332247.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/45436840880.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/28648284728.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bofovugobiz.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485be727f9---buzul.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/pusoxamakesobutufabiwiwu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dadc0beb8---lisurakanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=advantages+and+disadvantages+of+in+depth+interviewsPDF 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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 15716 bytes
SHA-256: d346d7ac23baefe73b78d175b97a4d1bc5ab3b9bc95cde7af2c81b176536089b
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 10864 bytes
SHA-256: f423877bb6f600501e975810fd65ff9d23532df1d758596938a675b4e030357a

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