Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c987ba5a5900f62…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 17:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54b2cffbe2e05176c052945c3df93ec3 SHA-1: 2c4fc83ea8d5b3fd4df04c491c30278814c4471e SHA-256: 8c987ba5a5900f62bf70389cfb0a38166ec341b3b87ee55433a0a41cc6a2600a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

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 http://elektromig.pl/userfiles/file/likobasa.pdf In PDF document text
    • http://confidenzacsapagy.hu/upload/viranog.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/dovifejizi.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/38096062575.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/7511495890.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/40720475308.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/fafaxesaxanagotapanugebo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328ebf9bfe1---1399282541.pdfIn PDF document text
    • http://letdentalab.com/img/files/sesemegilelix.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/wobosajokuje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdbf1489b---josutofenijaxilinibujapa.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/12481294877.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/76905912522.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/89938874535.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d346b0ee6---batixoga.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/8655058124.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/37075555014.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/80968031220.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/67110530129.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109050006055601.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kipise.pdfIn PDF document text
    • http://ymmicro.com/files/files/12553788887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+colorin+colorado+pdfPDF 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_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 10312 bytes
SHA-256: 8b411742c814ca5b2495add8518387b1f22453d030262f8008b3b60d2bb79efc
font_01_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 19100 bytes
SHA-256: fc147ceba18fc6a943faf34f4143050645bc2786dfa71fa3ea9db445a8a33ff6
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1