Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5f357de7487b3a…

MALICIOUS

PDF

88.3 KB Created: 2021-06-13 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0ddb6608e26c233e0ede947f81f0126f SHA-1: e34bf5c89fc6fdcfa907a91361b34df4863587c9 SHA-256: ec5f357de7487b3a5cae93fffc7cae91e3428e28dc88c2a3ba57c4106b563c55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=highest+belt+color+in+taekwondo PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f437aef17480fe5f08db67268d65c97b/neripezizetikolunud.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c35qk19bh3h7vmgassq0t5bckj/lijedinagigoro.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/gfmke94l7cc9p1p7bj27rmj38a/fotevadumulorivimaveno.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45259447728.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9e27a134db564650fe47b5d86bad582d/mamunotezudazojuvatu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/62725145351.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6563131a---xavafiruwakirezifuzupa.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/87caaadca1ebf58550ef47e73b86e83e/lelobik.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s6rpl1a1b25g82pagb933o6dt5/68768484260.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c297c397afc---5665311384.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8b67c960---3063106346.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/67665617756.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pijadepapugiziravijamep.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4566e7d74c---vibutodaxinikov.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0e57d6fff6579fe1a544288ae6d67515/60182554827.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/lps2p1vjiolcc2u6lrnf4ugfg7/17399104770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 8532 bytes
SHA-256: 4ffefbceb6b33ad13e7dba45b8ff9ab40132f2daf934b1848d0a77b86e45e0f2
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 5456 bytes
SHA-256: d738685969e4afab158aaaf1989bdcdba0dd034290f5f47afa7fe58bef59b974
font_02_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 11300 bytes
SHA-256: 62ea3821b53c7d69fef579018909163da30349707f43516650d0cef58debe800

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