Malicious PDF — malware analysis report

Static analysis result for SHA-256 d683997ef2ca8d6a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 19:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b4888c590309b69ed03247ccbfdd0c4 SHA-1: 59cbb061e67942bee5b02487b75270f3fac6c9c2 SHA-256: d683997ef2ca8d6a5d9adc44b5e95f799b1f9e83a69adcbfb190634d6880d4cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely intended to lead users to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chiengthai.com/file_media/file_image/file/17179183461.pdf In PDF document text
    • http://zahradysnapady.cz/soubory/files/ledipugudedomanol.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4f72dce72a0c45a999b022327c65b620/leladuzogavomemanoveki.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/wesewitugikide.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/75146614416.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a07eed4b---59787493427.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/25524702944.pdfIn PDF document text
    • http://debten.net/UserFiles/File/mosatef.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210718205703_jk8ibo.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/62326128678.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d1e86a85---buxarexirefi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f8b7228def34fd83df7da0923102b339/14655452373.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/nutawipodob.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bsbildpuq7hlm4q8ajk55gn5j9/37832342017.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zuxarunoja.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf1cae236---kexoxewemufosanikituguwo.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/nowabazivofegipetogebebox.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/midusedosupajodupabe.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610849807e848---pusaj.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/roxobiwabemomopotasakojal.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/sujejewe.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11b6dd651---kefejemutisezazimeroxoko.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/lovalu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1f4bc1a2---newefedebagelinobopemo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/lurarevenirodogizi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e92a219fd---vawudavikadikoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+redactar+objetivos+generales+y+especificos+en+una+investigacion+pdfPDF 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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 11544 bytes
SHA-256: 62b51fa158f095e02d06c97e2232bdb5d7c69faf9f71825f9201dae4145f0cc0
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 19100 bytes
SHA-256: 2f72984df81c7013b2bd505e16f0d13d1e60d439bbe7e967c15f2dcd3239b438
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1