Malicious PDF — malware analysis report

Static analysis result for SHA-256 914be3a4eb412f24…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 17:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fdc1cbb4c11397cbaf6741a5e26651cb SHA-1: 835ef887970b537661f5e5977ff05e4d50267810 SHA-256: 914be3a4eb412f24add3dcfbdb306f3dd05efb7e5958e5237eafc4713691ec46
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These URLs are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=elementary+dislocation+theory+weertman+pdf PDF link annotation
    • https://ovistar-dz.com/ckfinder/userfiles/files/kunewaxisufegiges.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6468d769---62663871916.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c0799a5fbf7---51741481143.pdfIn PDF document text
    • http://dr-temt.ru/images/file/58529990097.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/gudozuxokuxomar.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/57085138061.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609187f388c71---wovaji.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/bde1d3f977e61a2c6032e9827a923e60/savepesotajezirujibuz.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/87448703303.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/36706735404.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/85781357410.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56845805169.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb01c6b6f6---89040093446.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/sizaruvotabalerokezujir.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c2057114a2e92817ffa3336c970ed8a1/wejejukovup.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4b0467d9---41982747260.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf60e718a---83757282447.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/zenedowuj.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/65310df3af88ac304bce13c636e2bc3a/wegudefanigofowadezolaled.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/mugomifilujakovopevamujep.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082b19509e6e---34272432789.pdfIn PDF document text
    • http://belst.by/upload/file/83652058881.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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 11068 bytes
SHA-256: 6a093515380ca4a585ca590154c1b81faf62a42244d76eb9c4c85c3fac3d1704
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 18452 bytes
SHA-256: 12939e092fd0c050ef90a12fd937baf3e468c82342af49b8fd5dfe24127c6d1e

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