Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d334d98851a6dce…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 05:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4a7acb0d76213a12d06d9d3c9d37560 SHA-1: a5a9e845e83094a924408abed41c8f2c59950d44 SHA-256: 4d334d98851a6dceab383c2e7d9639d4c393b04ccf51864da2bc8c586cf62c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=turbo+lite+vpn+premium+apk PDF link annotation
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zasosuxuxanopogulamimime.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/wiwukivujevololuga.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908220609.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/29314142642.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a422ceb---88955042353.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d742238---11463563811.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/5851012233.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/supitasuzegipi.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/belijukitovifarujo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145905dcc2---ladiruwajezako.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161413c1c78e3d---87546770765.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/vewerenikazig.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/54911560638.pdfIn PDF document text
    • http://huefpdf.org/upload/file/71074857190.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/faxudasaf.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/jabodawenajo.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/30487151493.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_0439952756DF217F.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/75166260565.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3def7387d---kapizedix.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613461ac4626e---56666018006.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_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 10604 bytes
SHA-256: 40d0a30bb0ef245223d7ddd1ab98efbaae90e06c30cd9612fde7aea50e2637b2
font_02_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 18236 bytes
SHA-256: 064d1dd2d01b4e78b7f6a21d4d6ff1d0c3cad6f59bacefcd443b6f9cba0811b0