Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4d7fef2b95cb78…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 20:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7315fcc6c93209e69638ed8f74a84b12 SHA-1: d9dd44e0c6cd5cb95371ffa1878a5ab9a6b4b539 SHA-256: cd4d7fef2b95cb78cdf6378bd0f9c64c567ce21eb127d0ef5e4f61f4d9cf9c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=elven+surnames+d%26d PDF link annotation
    • http://lidaoxc.com/upload/files/viremupadekagogu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/vazezav.pdfIn PDF document text
    • http://tianfonmm.com/d/files/manuj.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ca43e0a058fd006d29290f47caaae7bc/70394740115.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630780150.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/47064471504.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/jesiriwiz.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/fowejodomo.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/gotifesok.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/43015821917.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/48536005779.pdfIn PDF document text
    • http://le383.com/uploads/files/54727802841.pdfIn PDF document text
    • https://pratham.one/file/38993546520.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210917204814.pdfIn PDF document text
    • https://beaszemin.com/files/40851346808.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae66e5aaa---37175617972.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe85b9c9---15583192267.pdfIn PDF document text
    • http://wsm.hk/images/files/vimijorunezuwaxafigawusi.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/14519723876.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/10965815079.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/jazaranezuj.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/30760829235.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/bemivotagotagareru.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109070019235774.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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10248 bytes
SHA-256: c005ef1240c5300990d8061c7dadd26cd98e7fe4b8080e737093263edc2f917e
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 19000 bytes
SHA-256: ddcad61f9e4d6b12c04709b0b4dac673ea3d4bc474637e64abb1a1b42bad600f