Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cb95bc060c966b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 21:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6444ab6b6a18240d1366f0d9ad0ec0ef SHA-1: bb37e9ee4e61e3f01dbaa01d7a4dae4ca1967a9d SHA-256: e1cb95bc060c966b9da14e8eb0488b4250278406a2b4a06af544d815404419d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, some hosted on compromised WordPress installations. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=shadowgun+war+games+hack PDF link annotation
    • https://vietrocknet.org/app/webroot/img/files/vadabixasopex.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/tekinubagipomud.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3ce63746---dotukapirij.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/27060910863.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c79ee8db---23289827109.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sewimowufozanevozop.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/rarujukumefel.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexixowuninepam.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/42228567960.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631219258/file/65803632103.pdfIn PDF document text
    • http://delve-cr.com/uploads/jilibopidigosomobedafasav.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/muxuniwobalosawosadusom.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffbd0b6b8---mikomulo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d90d75394f46333594372df97614ce4f/vatulixew.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/bejewuvogu.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/rixapezafiwotetok.pdfIn PDF document text
    • http://partnercable.hu/files/61913489066.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/76545898007.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd30aa78bf---rekawenepuxorumipuzif.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901215329.pdfIn PDF document text
    • https://slide-bearing.com/d/files/13764007512.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/78622527659.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/waxerajinubejubabizibup.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/dalopevavugejerali.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/mazizufedixetowizazul.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 17360 bytes
SHA-256: 4b3965ad4aaeb333592827b35e86fa59f4b600db97fe007d6f9814523641e791
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10932 bytes
SHA-256: 80f7958c711b785472a2c67fdbac149d40fee5119a4d8ba50ce4f76b9eba2edc

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