Malicious PDF — malware analysis report

Static analysis result for SHA-256 6381d3d48eac7947…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 19:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10417397101003c4945803f68aa41ba3 SHA-1: e992fde23e4fa2ee8b7d3dd55c075666d5386741 SHA-256: 6381d3d48eac79477cf5b40d842fcb653359064816c428333cf9bc0ea4120c41
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs associated with compromised WordPress sites reinforces the likelihood of this document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://giritrademark.com/content_files/files/7681256945.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1901ed89---70748798737.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2c916c97---dugeje.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/96431167647.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc09a051a8---25316666603.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/14252223658.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0c87fc70041f86ad780b3a590c1075eb/23609779492.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/93574775807.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/nakawavewotasileparerowo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/58022685644.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/76653180487.pdfIn PDF document text
    • https://ivanamihic.com//files/lisokemowevetedegojikif.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/65757235658.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/wibabejolaferenok.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/96673260527.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/72776447285.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jatasukeboletevuwinut.pdfIn PDF document text
    • http://cutskytools.com/d/files/fogemaninukimopugibova.pdfIn PDF document text
    • http://modern-pro.ru/files/file/41902978722.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/76408309793.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/48861180169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=npa+of+private+sector+banks+2020PDF 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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 17044 bytes
SHA-256: cfd9b52b4bea28187e2a130dd29c4ca085ba541ac9593e337ee4fa417ed92981
font_02_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 10944 bytes
SHA-256: 98d5b689f165b60a92b6d5b9da4831f60fc087273ee68165591dcc42ba23e22d