Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b65690ec5b6596b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 23:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b749996b8d18b36b960a94c45f271ea4 SHA-1: a6758558f003085ef8c321e0a761a8e1e42a5495 SHA-256: 9b65690ec5b6596bf92e07da9b95a73ddd5ac312f237b4e0b16e09296fdf78b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was generated programmatically rather than being a user-facing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://delcinfo.ru/img/files/files/78368546436.pdf In PDF document text
    • https://anhhuynoithat.com/asset/files/35840008703.pdfIn PDF document text
    • http://tiquital.com/documentos/file/64680200383.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/balevuzojetepepofeg.pdfIn PDF document text
    • https://europartner2.pl/uploads/bejelivetufawefufebi.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/kosabotagizekubutifex.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/damejejanojupuluzegif.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161490ffab54bc---20439812065.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/fitilav.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tf4envgsnc91lja239lfib3uvm/savokagiwagu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/41121781960.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/36852297082.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614561ad08fc7---34502342590.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/26952974062.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/67038188107.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/tigarodotoserujazunupef.pdfIn PDF document text
    • http://inica.org/files/file///93187870094.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614584a60cbdc---likedetagitub.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/68124784143.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zipunomimedojuxujefalabix.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/4515937263.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/72195055905.pdfIn PDF document text
    • http://ingore.cn/upload/files/vunizigizepoko.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/45590486409.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kijufumofasupawukidarike.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/suxopawebenomolizawuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=johnny+crash+does+texas+androidPDF 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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 10628 bytes
SHA-256: 9303506bb2e371cf583ecd6ac27d78d20c959241ba8e6f7e1731aa05cd77bd0d
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 17280 bytes
SHA-256: 6487b773fab9a2dcf613a64d807dc39f8f9f4a7a0056941a5d26fcb6d05f5b3c
font_02_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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