Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5332a798e177a4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 00:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d18acd1df14d938dae7af21de1a08018 SHA-1: c80d7740196a3fbe5df05c848273ccf4d28d27ca SHA-256: 4b5332a798e177a46a58995a43ba196459dc1acc75b2cbbbab86b3d0283b4921
164 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one pointing to 'garglob.ru' with a 'geometry dash hack' term, suggesting a lure for potentially unwanted software or malware. Several heuristics indicate the PDF is a link farm, with some links hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=apk+geometry+dash+hack PDF link annotation
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a522d7d6---32749780716.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/xatapukuwakijinuvo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zejavelusibiw.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/rujukuxuk.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lidisunobo.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/bofupabolon.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/butexin.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/19355248791.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/ponejavadipogenumemaz.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/50413212351.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/ravigegejudisu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/95252950917.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/17615898064.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/56565784026.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6e7618af---kujukewufabino.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/37104872423.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/gazufixex.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/25747207793.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210919_89A889B781A2FA7B.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/wajebibagepikolukeb.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/zafaved.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a0b1f65249285fc458d9510458330205/63860863748.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/kefigubipadebama.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/21478366569.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/29707747476.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 17436 bytes
SHA-256: d23b945bc3e3e9182e9c97eed1f861c9322fb18a7d2e1dd464f8de51d2c2d362
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10904 bytes
SHA-256: a759ff3da29bd9e5d23bf73da6f102b8e6ced3bdce73369ce0b5793450dd8926
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1