Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3d5a8db91002cd…

MALICIOUS

PDF

128.9 KB Created: 2021-08-03 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8d7ff9141e56915733102250239535b SHA-1: c87a56efda0d397ca1d1a35fe89fa8df1fad53fd SHA-256: 4f3d5a8db91002cd2dca785acf839adbced905ae432121a71fe0c3320bc038a3
224 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for requesting recovery secrets, indicating a phishing attempt. It also includes numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://digireg.org/upload/lokilomugevadu.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3637060fbafdaa567cd009ace5aacb5a/38336300051.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ps7p7fim9q466vpjtoe32brqfm/6649448257.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/barowibizewate.pdfIn PDF document text
    • http://bakoca.hu/files/file/tesinofikewetute.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/33280782793.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c2b55a451---boxadegesafutosexekevir.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7d5e6f18eb4b0e8d471403734775200e/rixujikezufibijivixiku.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe170f737---godekox.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/96772937716.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160907ab4183f8---manosoz.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a722b0d9f---56866157101.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/85456168667.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ec9d1b9bc75---samug.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acba4e022d0---47141979969.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/23065855465.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/84614916327.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4540ba4cce---36800093928.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ead0dcf0143eb391b4eb8413694aa65c/movigijax.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pazomidifi.pdfIn PDF document text
    • https://hagepoorter.be/files/files/90904413977.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/evi6rpo9b9n5u8ac6mlg76iud4/19056483125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=eth+miner+robot+apk+downloadPDF 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_off000191b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C7 10792 bytes
SHA-256: 49d471b61add7178b4f999f05026f89ca8a9e9b8bf2a499a742c46ca3e4c01c5
font_02_sfnt_off0001c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C224 19256 bytes
SHA-256: 891290ed2415521d224cfa2a645b33d8e0c9351c94ce287341cf68367b60d3b5