Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea04f9c815341c2…

MALICIOUS

PDF

88.7 KB Created: 2021-08-24 10:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cf4d1d36679c453a4fcc93036010ad6 SHA-1: 44ba2dfcfe98850a92e40dfc1e37cf74b24cc2da SHA-256: fea04f9c815341c2ce6f39dbf3b35b706c4add4226146abd6620a836a560603b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure point towards a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=soccer+drills+with+2+players PDF link annotation
    • http://vietkinggroup.com/uploads/userfiles/file/88690659803.pdfIn PDF document text
    • http://prosquash.by/data/68576580618.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f6244d7176d0ff3437ee70ea466c7b4/vabeligimenunagunob.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/13396935890.pdfIn PDF document text
    • http://wwsm-us.com/files/file/pepatoguxal.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/pezikenawupofazokipifele.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/newubam.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b12e9a97a---fexopuxaxolupubisirape.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a0dd980c---81470761886.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/raragegaret.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb01358946---63633549128.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/dikagosisorupakuriga.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3dac4385---diwegixelosisikobajowetit.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe9452c1b---99991168381.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/8911050279.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/gamebaxebulolo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ii00budog5lma55vmfi0tkvqo6/34049319316.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/94897033157.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be13186e9ed---91025678233.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bitugiruwoxamow.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/176d529a855ff9acf09895b814140239/42715133449.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/xuxinokebapunibek.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bf0889b801e497f9fefc2ecf3e2a72ca/57949096343.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f1191016a2ee49634e68d9059663665d/76677494.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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 18088 bytes
SHA-256: caf51b7f4ee2ad8d5fd0f8d8fb168beb0eeb74eaaedb5adb1c625b11ae7d6ff6
font_01_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 10904 bytes
SHA-256: 1fc70df02797ed2a3df7bcb1209d0066aafc3902d13cfc1935301b63f0fea752
font_02_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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