Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5343e440a5f492…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 12:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb022f4916ae45e3a80f85e1d6c7eb09 SHA-1: 69b0367575622da80c60102c407ad1cbc94a7f85 SHA-256: 4c5343e440a5f4921b39a0e77a581503081031ed7de655b1bf60ea72726ecbff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=download+gameboy+advance+android PDF link annotation
    • http://kaiyudachem.com/filespath/files/20210901215329.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/24969730530.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139db368e9fa---mafegilujaxep.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/lojepof.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/dovigovurimuruvo.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/17173691905.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/3101044279.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/salovikudutaxuruvupi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/32585434463.pdfIn PDF document text
    • http://creationart.hu/files/file/63096428414.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5a9c44ec---xafasudedape.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0e983e66---19327097936.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/javiraruve.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/18900846951.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/toxaxofitit.pdfIn PDF document text
    • https://songhongresort.com/img/files/vejasijilinalaxiwobukel.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gepexogebif.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3e124452---bigatodujigetes.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/kexakenonijumuduxo.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/42801570814.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/gawaf.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/jarelubimipepufonesezen.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/laruwonizorilorawudu.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/nekakemo.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/47435817013.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/saposiwasuwigezededubak.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_off0000bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 16936 bytes
SHA-256: b0bf94634e38305853bfa54ce173309f54e37843990f6d45e3d461ecf1e09898
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10856 bytes
SHA-256: f119f7ddeed0a47c23609a963ce5625eb169782b94074e6dab63c1e568b589c1

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