Malicious PDF — malware analysis report

Static analysis result for SHA-256 312be9900ba8dd9f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 15:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b07371293ec8fdd5c52b8f130a60d9f SHA-1: ece6a9a0b735050bd637e46df55a6613dacf4149 SHA-256: 312be9900ba8dd9f11ceeccf37a5168a7f3ed3d11ec90b2208debb19c7568e36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://salman-is.com/userfiles/file/63101474578.pdf In PDF document text
    • http://ejmk.com/ej/upload/files/13644157971.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jibume.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446086e94f1---doxilulufijofipanisopota.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/137d9ba2c2b54f7db26209308b38e454/mojonanigivipiwup.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_075249_122.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/pakovedukimero.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/79962154799.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3f1eec90---49177931529.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8213tlrcrfudqi6sdlnp2n4iih/89167731980.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/64074899515.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/44086024832.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/40670218241.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/gakibimurex.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fowojiligikaxafebodoraviw.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/zagabifatoputenixibi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139aecf9b470---14514006455.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/bevumevunuvuzuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+nes+1200+in+1+apkPDF 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_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 10660 bytes
SHA-256: 2c50e5fc7df717309c23d9f6745dba28911a733c0182bcb2c46628975aadfe0f
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 17024 bytes
SHA-256: ab40a74b24e01c79c8a8d84406703aa7e1bc14ae768529904688ccd7d13bfa66
font_02_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1