Malicious PDF — malware analysis report

Static analysis result for SHA-256 b111f80f1a1e6259…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 06:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d5e705d8b17fac2ce3a0e89e83d6b7f SHA-1: 26b21d7dfb4ed12de676374a511244d2a18ea911 SHA-256: b111f80f1a1e6259834290e7b2415adcc835213037a2e6a5d4087e6d641e344e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://dglytbt.com/upfolder/e/files/20210914075337.pdf In PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/jedow.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k828d9ph9taiioo10q7u3ffqnt/wubalopewetuzamokom.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/kejagus.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/jozutebabogimapa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/nelojoj.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/tukosidejeduxibok.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zawokaladusomunojon.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xufoxowadolifiwuvu.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/jajasowawenululokafariz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa368d71705639b9ff077234d731756b/pimopik.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/48980087481.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/12471376847.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/patoko.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/xefegepamusaliparofivuweb.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/furizuximigimifaju.pdfIn PDF document text
    • http://lodzkiespotkaniateatralne.pl/userfiles/file/38994387682.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/romisuzagozamujib.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/84575331061323b48784a7.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0470a91a---61115388120.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/76847939458.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/nudovuke.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/gipobemagunilezajinuxofiw.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/mutelagugomabalu.pdfIn PDF document text
    • http://gikguamerica.com/userfiles/file/xejesa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d2337155---xawilagapigijenojetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=diana+in+her+own+words+online+freePDF 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_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 15052 bytes
SHA-256: b7e1e479fa8a848f711c4af6e9bca2494e1ab3b80b4d45554690d2ebeac5da31
font_02_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10440 bytes
SHA-256: 8ecd8214dbba37a5bfb3f9b92e05d696e0fd004aa95f1e31340a5b2feb2d2e52

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