Malicious PDF — malware analysis report

Static analysis result for SHA-256 c133d67644278b5c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 03:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 241abe11fb45b422625acc5f198b4bcb SHA-1: a0026886b1073362e0b0be785aa1ed931d06a1ea SHA-256: c133d67644278b5ce3bbf79a3cd26e2301670fc6d821e39c259084dc1be06212
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure aiming to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://quangcaoxetaxi.vn/upload/fck/file/99499225333.pdf In PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vakurufimigijixasitu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/wasenutuf.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69b367161---morive.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074484da889d---32037153693.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16116a8d17a6c9---60048961782.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ed300dc1beccf1fa77989edc1c439e72/16491518001.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/49a84abd28fb829f9a4127455fa4e6df/walifipukumuwasezew.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/56388742106.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/mulumapatusilaridiw.pdfIn PDF document text
    • http://huiking.cn/uploads/file/180211397779.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/padovesidaja.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/79683083160.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210630102633.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/89917150568.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca62c7e84d---mojipoxe.pdfIn PDF document text
    • http://thevale.us/userimages/58551941654.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pidthf3no2ln4vabrecsjk7fs6/jixivojakaduj.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/013fa06acc0dde0345f165ee9a822d76/58940106237.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/48982077033.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/53040483944.pdfIn PDF document text
    • http://blueyee.com/upload/file/102305271523.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b918ef81856410a348f1b96b23139da6/28149797265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=last+year+tet+exam+question+paperPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 19460 bytes
SHA-256: 3935b251689cf1a7663cbc850ccb6e358095c44bd227d6b4e4b55a8726d733af
font_02_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16340 bytes
SHA-256: d42aa4f62c5d097899f4ca83752463671ed36338d1a9962ec0518aab4c0c7761
font_03_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 10784 bytes
SHA-256: 50232aa7916e338424a44352f282be84724fac3caeeba11091c51f734921d40c

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