Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd414e493a2a6c86…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 21:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19ec06873c4f78de19a66c3983011913 SHA-1: 8a704ed867978efa036f43235e79d0ce2edad073 SHA-256: cd414e493a2a6c86d49b80e718723250d1bf0c535a2156e557420be44a778ea4
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=city+car+driving+mod+apk+download PDF link annotation
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/216f27718c378258994ab9b6357921e6/17250971844.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/kudexulegadi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/gijowimakoruvube.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_084921_162.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/vukaxixifiri.pdfIn PDF document text
    • http://benly-carson.com/product/files/37604792781.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/tegupajejepejug.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/21537640453.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/lafikenoda.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/42863361354.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/dekujoxagujelid.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/lezavivavab.pdfIn PDF document text
    • http://space-edge.com/upload/files/36249866970.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/wuvibow.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d1b0409---40659612691.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161345ffab4e9f---28859542238.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/reduzuwetuvoworavane.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tudogukogozifazom.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/17190348658.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/65972553025.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/4420456561.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 10944 bytes
SHA-256: afb074b2b2f143d69c06199e1011da9b0b0419d04952269766403402ab96d822
font_01_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 17764 bytes
SHA-256: f75da3485a45c129682e6207e69be04468a5882a654fa7de484e8791eaae56a5
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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