Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc02db6048af0fe2…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 13:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 779dd73aa61da68a760065c3147a01c0 SHA-1: f0cbb327183e722b7b48c73d321e2833c1d1b069 SHA-256: cc02db6048af0fe2805a5882afcfcbf3b83eb982eb0ac221de768fd5ff1d639f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories, suggesting an attempt to distribute further payloads or phish users. The presence of external URIs and the link farm structure strongly suggest an initial access vector via spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://diclenakliyat.com/userfiles/file/waxeba.pdf In PDF document text
    • http://cs-golfclub.com/ckupload/files/zowij.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/81c1ba5c7f2ace6656459ba7c31e45b6/durugesiruvuwogesizewezav.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/wavexe.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/15765302619.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/80371577620.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8fcd39c8---32310463165.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/990c5b7e7c5eb30d6eb770072e6f4c22/bifovodaropusokagorukef.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/wasenilevata.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/65281118203.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/9husies1i72j0e80l1lh00etdv/16033541731.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/devujoxamizunure.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/bibiraxaroguf.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/bupewabesidoruvajajuleji.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/juwumowo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607173f6770c4---38045029506.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/45779222997.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9889fc2a---82726413357.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/kosibovesom.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f21c2626---30121423541.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9e55da9b70e25700b81260d316bd835/vonuvurepapexi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71406548297.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/vilenokubitonajeroxukege.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/23606020537.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/55041158195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=research+on+eyewitness+testimony+reveals+thatPDF 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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 17068 bytes
SHA-256: bacf096710eb2f0478fd65a244a59ee82f6ee431ed525e1106b598239d4eaced
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10808 bytes
SHA-256: d20f28b4004193b81e2341846e01021b64dace29c1dc39faff258176d1085708
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1