Malicious PDF — malware analysis report

Static analysis result for SHA-256 b799dd98a585dadd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 19:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c61e57c99dda197d18e87f62b2c46ba7 SHA-1: e2b2d43c0b46f6d5026d5251f906cbbe6fe1d278 SHA-256: b799dd98a585dadd0136224906477d64ae2bf4200b6c6e32a4a8113468ba1bf8
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a link farm and a browser installation lure. The document body is heavily obfuscated, but the presence of multiple external links, some pointing to compromised CMS uploads, suggests an attempt to redirect users to malicious sites. The primary attack pattern involves social engineering to trick users into installing potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://moiatakashta.com/userfiles/file/27444079918.pdf In PDF document text
    • http://jiuxingchaoshi.com/uploads/file/030137183383.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/kitis.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/59073893352.pdfIn PDF document text
    • https://lorus.rs/files/miluli.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/48324127848.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360b1509436---26267271537.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/90799686608.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/jomofolire.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/82225454583.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/89669898220.pdfIn PDF document text
    • http://webbuilders.com/files/file/53557718766.pdfIn PDF document text
    • http://acelybio.com/upload/files/kobumuja.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d158498---57213852622.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/88613876263.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/86047178812.pdfIn PDF document text
    • https://uangraja.com/contents/files/wavipalapopoluwizagunire.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/pufikaxeja.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/69232483471.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd286ad2b0---zigolimolifu.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/78006078323.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/dogela.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/dalufazigatiloxuboponi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mx+player+apk+free+download+to+pcPDF 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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 10740 bytes
SHA-256: 2ee675d474cbb11a14b4bbe9cee55529918848eb31a8d0adf98f6aa735dad8de
font_01_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 17824 bytes
SHA-256: f91c081cb6615047d6b9cd4dcdd2853903291e9caadcc446767238be7ea69518

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