Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5749b62e103f2f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 21:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa74ef9ca3d12cdf91a50e084c9e7cde SHA-1: edf3d229ca81eb5e6e24729b79d9affebe66204c SHA-256: cf5749b62e103f2fc1561aa1d5acc5cde4030b3a8055dc620888065920d86d5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links and the overall structure strongly suggest a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://vinmexindia.com/uploads/volixalote.pdf In PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/desofo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///luwiditevepipipidufozir.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/63647766120.pdfIn PDF document text
    • https://allianztc.ro/files/file/sukizuzetexawiju.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1838d65cf49dc43cb6c9f97b4e9b7487/pabofamojewegemilujavixu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ed963cf56---mogebizir.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/nesasewudezufopisupev.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ea552c20c3734aa253519a8d9fe06b6b/telabexo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/houeidf1v8a4kvuv5b6akoar78/nirilesabijidosudobukowu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/fumeritulidevofomu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/aa037537dcf88f42d6079a1340f9bc1c/29007014973.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8e483cc5---pukukimedalimelidi.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/mejeg.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/30537614136.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ebf7a9faaa7d7d14d0dfada3fec39374/godogibojibogifom.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/071bd7e2dd5d903afe63a4342c76d63c/99438680724.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161140bcac5646---89654493610.pdfIn PDF document text
    • https://digireg.se/upload/jidaxusuxolexegowudedasej.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/19409951702.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/11528363519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=water+damage+ceilingPDF link annotation
    • 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_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 15220 bytes
SHA-256: b7864c714f933e5046ffc0e114c128bcc9a8a6a366fd7bcdfa42aab158bc6056
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10420 bytes
SHA-256: 418763ea41522f6e2d115bf1a046bcf90710fb57b8cb248144f9557363bd013f

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