Malicious PDF — malware analysis report

Static analysis result for SHA-256 284364139580dcbd…

MALICIOUS

PDF

79.6 KB Created: 2021-11-06 12:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e554b857fd6981d97c81c5cb508d1ed SHA-1: 81a1055dcb1170b7a5657937512fe24534232bf5 SHA-256: 284364139580dcbdd7089313ef5ee541fe21cbabdac0a3f7e3b279887f9b0a1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/iqvhiin2of9uvsoiarevdjkdm0/wigexivusa.pdf In PDF document text
    • https://zhavezbozi.cz/data/file/gubitotuw.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/49142333717.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/litiwemonulapamupatixi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b22e61fd---dakegipiraw.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/lagutiriluw.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615c14855edf6---38386038108.pdfIn PDF document text
    • http://st03.it/userfiles/files/duxabipotupebijilirev.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/70393261871.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/94204723692.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/16f4evrmdpi5qd2fj3smmu0ruj/79059536834.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/puwugonafokugirukukabiw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161644c001c335---43074539641.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/fusemunijajuzarufumo.pdfIn PDF document text
    • https://scalping.ir/data/files/file/63168022202.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/33653597170.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/damopapivawa.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/38889445579.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/28163987381.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/i2rahks67e6rin0je00slndec3/sejuwikufudujewakugigu.pdfIn PDF document text
    • http://446888.top/userfiles/file/83668643485.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/55608852448.pdfIn PDF document text
    • http://e-hematologica.com/users/file/puwisuzesa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=smart+learning+commonsPDF 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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 19184 bytes
SHA-256: 96a13980ebf4621efd8ef5eb626db4991d56cb5fbfa6f34e525f9e48ff0b7f25
font_02_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 10648 bytes
SHA-256: 647a15034b11bfb33f88397c8ed609beb4c6088543ded8ee65d156d38915c359