Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c56f3afc149d032…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 17:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d1e06e07f8e72fb6d0db2de219d6a7f SHA-1: ef04f96f626a557a5e3d423684f577b8c1c813d2 SHA-256: 2c56f3afc149d03257e714a1b037fd1d719475b34ee33b5da9f0e2ef6d3ea2e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://foodphotoshop.com/userfiles/files/36577991504.pdf In PDF document text
    • http://brilsports.ro/userfiles/file///nomanejinuf.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50ba4e8de---muxumuwaru.pdfIn PDF document text
    • http://servauto.fr/img/user/file/kimifex.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/raxirufadu.pdfIn PDF document text
    • http://sbcnepal.com/images/file/69715239011.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/jebijofujedagodipetadab.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/470084041.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/41188640091.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109050216201592.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/4855786191.pdfIn PDF document text
    • https://magerp.org/upload/files/76499485915.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7cd97caa---63863553957.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/62009019669.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/4656879491.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95305717676.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4bfc70df6a47cef0336ecd5584507dea/47113249595.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/44887762819.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zotavovugidivanak.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/87071730985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cabal+m+heroes+of+nevareth+apkPDF 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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 17660 bytes
SHA-256: fa8502f1556273cb871edf9de7fb1873b7e7846f39b478cdd71a0a7ed13cd280
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10860 bytes
SHA-256: 26ab2181f7a4aa9ff5b3dc5e0a01b3e9ab653c555d977c8d7eceff967ada7917