Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d128b3d93e4f39…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 06:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d84f804008a8762a034e218e3685d6a SHA-1: fff815c471bfd8dd4a55f94e4cb032525f72bc58 SHA-256: 85d128b3d93e4f399f550fd477aa4d856040ea63fb23d10965690b5e19f0deb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=pixaloop+pro+apk+2020 PDF link annotation
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9332f6a7---wozagexos.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/nadukekidofatadevazonofex.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/69582878078.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/47274151993.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/mejesewapojun.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/desuxodujalotolunuju.pdfIn PDF document text
    • http://sissonne.hu/editor_up/tukawolodanavito.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf9987c82---bedixijavibawigopafuser.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/41608137691.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/nekugaxanezutitimovitu.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/zomodipafefepeke.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6b1351e4240607b7cd030633b3c38418/53685364729.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/11412509899.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/58935693800.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/13267816717.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c7dccaf3---voxejap.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79808140968.pdfIn PDF document text
    • https://diphong.com/uploads/92275045707.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021916035542801.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26085254068.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/monimupuvipex.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/35783433135.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/78927285158.pdfIn PDF document text
    • 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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 10180 bytes
SHA-256: 9e39946c813c0805f492828dda4acc81ebfc858cfca7ec5969873bc0024f54b8
font_01_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 17532 bytes
SHA-256: f40064399a7063b5d1514f40451d74ff3c5a4a39d631f84b830a220c15fbfa9b

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