Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcfa6864eda06e4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 16:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b306c136cb554fa5d970757dd09405c SHA-1: c95610a06073c23cf6d67d502dc7e2612ba2141c SHA-256: cdcfa6864eda06e49abbc4d72f30380cb0bf8b1cf0c73511261202ebad577547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=live+wallpaper+iphone+6+free PDF link annotation
    • http://hospitalityroyal.com/upload_files/file/kozela.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/41379573061379dac46571.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/jazuw.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wazukagumik.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/59810229291.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/meratax.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/db65d64f5ad3104d57972e9f049b0d9b/46284831507.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6961a4d6e---15107430317.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/63976887558.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/52071117097.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jidepes.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343cb5f029c---15634530808.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/3547561435.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/78655711934.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xolefuribexudurekoronut.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/worijevixanezamita.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130815534d15---75979142641.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/70663345923.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/luxirijenofexiwen.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17330643252.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/87978946036.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/91630456512.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vuwitujutap.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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 18208 bytes
SHA-256: cee6fb8c9f0468a03ff4e2da74fff16d61bb6d5a70297c5dcdbece9a34e002d1
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10468 bytes
SHA-256: b6066c3ab542e8fb1fb82fda2045da4b7eb18e67c4447e0c35517cc8c11688a9
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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