Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa998e2348dad14…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 10:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 853ce253d59d6aa174514e682f26efa8 SHA-1: 4a537affb0bc7ed851137c35fe6d2a8e4f00693b SHA-256: 5fa998e2348dad14e640e69f035eb169f44d4e205623451e2afc9c8c9be6ee0c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to various domains, including one hosted on a compromised WordPress upload storage. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kitpaisal.com/mypicture/file/10391459330.pdf In PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/12899854380.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tekufuxugafepinub.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/43639242408.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/xegavemexeropegetagaduzo.pdfIn PDF document text
    • http://ranchobg.com/img/file/60418497868.pdfIn PDF document text
    • http://etre-belle.su/images/file/31280610578.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3e0355fc---26761160197.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/72193279113.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/fubanozeditetozekidemubod.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/30502903509.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/35963227174.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sokub.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/43047730359.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1c3c93b8---59551685308.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/64844119117.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/sovefowozeparovutujev.pdfIn PDF document text
    • http://immopolignano.lu/images/somugokabidagipigikizi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gewudipakubuneninejo.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109230554396680863pdi8sanuyi3.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/34185129647.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/lilimanuwamiwipetimeduw.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/faparazegazotegakebotup.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1de427d---dediwigalonekarujigap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=super+mario+maker+apk+download+for+androidPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/sevinazaxudutazanifugomi.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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 10744 bytes
SHA-256: 265c256e23297fad45a9e70c9590a3d562fc63488dfd5de03aa78f205f5f0411
font_01_sfnt_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 16776 bytes
SHA-256: 5077f361b206cd4262513f51361e192b8f4f0ed89637c3fbc38a4e4429b5e74c

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