Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3c539ce53968c3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 09:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c338f4be0c2ce7c33b4d3682b828cfa2 SHA-1: 2f5bf413287f7dcf466ed625182ebe5cf723dd0b SHA-256: 4f3c539ce53968c3261d534a9f35449a5467494fa587bcb4cf630efe5df286de
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or credential harvesting attempt.

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 https://allytemp.ru/uplcv?utm_term=fax+online+senden+pdf PDF link annotation
    • https://stonebuild.bg/f/uploads/files/pupojepamivilepozagaj.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/35266945776.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/96084685862.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2c6fcfdb44617c93a5387e4025bee5f1/47250004510.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c230f6ec43---nonugurilup.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a36a7bda13---94435122954.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/pofozalalopagi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/25b250d79092afabd416cc4e8a8facf4/474763708.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/dowokifadezited.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd34c2e9fd---37429796688.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/75636661279.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ovn632qd4eigeipqotvs3li752/fusudefidivolapasixeti.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9kcguqit0ts7tdj5aqm8gqh4v7/92673904072.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/nowojixe.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/39203620306.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210704/file/ruzuriwugikavo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c509aa63067---4375743758.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/6f0eee23883c5d584c18ffde3409a078/29489803932.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210606_070148_5645.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/74794266811.pdfIn PDF document text
    • http://szm.hu/userfiles/file/54081334148.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6f5b7ba44a857f077f81337175627a18/betexulilabubivi.pdfIn 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://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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 19080 bytes
SHA-256: a088487dbea1cf3c517aa844be0d981ba9200c47912dc7387ce0c86a2142f4c8
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 10372 bytes
SHA-256: 6f3519f61cab913890d975eb96778c840c0d440b8db5a5d40ae0378926543936
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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