Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bda16f58bbb42ce…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 22:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd5ba14f3397b89584a0a71d235109ed SHA-1: eea1347eb5b98e4a5982934405b7551270b5fb81 SHA-256: 6bda16f58bbb42ce1aa77d132c82cbf3bb76ab9cec5a4c546daa24bb826b7c3b
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating it is designed to redirect users to malicious content. The heuristics suggest a link farm strategy, with compromised WordPress sites and disposable hosting used to distribute further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=farming+simulator+20+money+cheat+android PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134698d8aa44---1984899000.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/topazunumatesazun.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/jezamepagaxemadonokor.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341536ee6d6---midewuxo.pdfIn PDF document text
    • https://aspirans.com/files/file/fosazanajabijoreme.pdfIn PDF document text
    • https://umartravel.com/files/36511150615.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7f5034ba0cc246ba5f2289809b629304/galowanirenisen.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igadewewevakona.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagojoxebobazakosokoset.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/256719057.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/baximumapadiwup.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/pozinuzenoturedomigel.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zegalawobalevok.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/temisedidituxesekakokoj.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/piwaverobopunilesujur.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sawiwafesujetagopesirane.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/jasefivezijul.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dobanibumoseraralax.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109090418099664.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nobajikek.pdfIn PDF document text
    • http://upakuika.com/img/file/gedaxawebipujurogap.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/71288631805.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/22274218893.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/86499454525.pdfPDF link annotation
    • http://qualityspices.in/ckuploads/files/gasodipil.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16820 bytes
SHA-256: 3ca67405ece144c4a6c6a8e40a7eadf3f48d759c8381bea0247fff6ded972497
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 11248 bytes
SHA-256: 39ac99e2289c923406fe191b0626d6f19096a513626882cd949d443907b58f55

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