Malicious PDF — malware analysis report

Static analysis result for SHA-256 663381152f8f4311…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 23:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c70d7c67f495eef778be73495961db51 SHA-1: 03c3c7ab2928a58e96e717852caedc60e708ce40 SHA-256: 663381152f8f4311d88eebda881712ea7d2c2ae79c3811fb7e0627c97f5344bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URLs, including one with a 'utm_term' parameter often used in tracking, points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=serving+in+silence+full+movie+free PDF link annotation
    • https://ijtm.in/userfiles/file/kojatavudilopuve.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210916235723.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/63532655072.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/44790113936.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/23157262199.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/saxevolifiximunugedanega.pdfIn PDF document text
    • https://actor-conseil.com/files/file/63197445719.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/85279918100.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/98035157054.pdfIn PDF document text
    • http://perfectprojects.ro/userfiles/file/jibedididizufarafunigef.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161456189dc18b---6577211315.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/89456424031.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/vojexamu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140803c83aaf---71780784900.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/xegapozemajomub.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/36576352935.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/loralekekikukifevi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/36204384820.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be04874b54---rexojojafutafixojimo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/2755251830.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/75657310819.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9878c10a85c0b4efe90772a976cf99f4/13120165255.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631817988.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_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 10660 bytes
SHA-256: c22e29e7e0aa06f9eede9f46a0414e192bdf1c4f79d3e0054262db904b40c7bd
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 18960 bytes
SHA-256: 5c57cf23990d772217e4e9819c24e36c8e98eb38d9cbdb5773e695765cc05993
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1