Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5c50fde126cb15…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 19:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 051167acd889b6057df11d843a5e9da1 SHA-1: 0e1ba2e30f864571f1fc5a295d23f061adf7f4c4 SHA-256: 7c5c50fde126cb15da19ae194f08d0477737dd3434a8cb7f52b78fe57a63cd52
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0d00b5252d2067dc59b3a8fafb156fc6/paxegepedikotezaguxoxaf.pdf In PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/730839943.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/53467184965.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/4775619262.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/xizuru.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/zirutarisugibevusefo.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/52093467607.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210910025844.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/biboposol.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/zaxudixux.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/66533917338.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136512a84c6d---nirakogo.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86182960386.pdfIn PDF document text
    • https://hirurgija.me/files/janewe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f0df0e8671afe96988f5f51c5c1c4065/80071679296.pdfIn PDF document text
    • http://tipiland.net/upload/file/89647903419.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddedac2f5---52051287481.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/vigulebaviwakewagotuli.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/16775262495.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304dfc3fc62---84467069648.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/27977736622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+restore+all+data+after+factory+resetPDF 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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 16840 bytes
SHA-256: 13bbd5dd89fa3d94bf80e4feef26971016052dfb484c418cdfcf3f4a19abded4
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10464 bytes
SHA-256: 0cf39f89314f8b89fe996080af69bf828486efe78aa2661ba75748e2470e43ea