Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade4bde418ac286d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7e6d864e5177e5fd845e7d128027029 SHA-1: eccc36046d81f069c2319d22c67274f571d0f943 SHA-256: ade4bde418ac286d8ccdd46b99ea3be14542a89a00b31da03983ae52acc6962c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=droid+2+sim+card PDF link annotation
    • http://mudrberanova.cz/userfiles/file/kabikejaxozivo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cab073ffebd9fdc775dd57e02a87500e/gilim.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_163618.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/38512235268.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9634d965185aabdd8daab0fb65b3bbf9/borexameduj.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/kuxojonigovas.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135925aab729---9432098883.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/zejowixegopirebirineb.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jezorirogelomezavor.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/gamas.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/18624378146.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/zamokidikaxunorenazerelum.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9166443aee5f509c9c2cac9aab15cacd/gatimegoletaduvizefifefad.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/071814461404.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nbbp8qlpeqokk4vsr2rnbm5u22/fikesoxeru.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/eb7610bea61e0d80d21353fbf8ad727b/kibomi.pdfIn PDF document text
    • http://packamate.com/userfiles/92311240651.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/pofukawere.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/86455366797.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613581f616055---25719806092.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xaparikogejip.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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10272 bytes
SHA-256: 4aa431e722cce09e0e5a4003bb872f265291a0f0acfe7a08f89c9ebedca262e3
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 17404 bytes
SHA-256: dd54bf9c1c8d49ed2768c03031c51f97980a9a4cfdaad0031d17fe3f2c25ed2b
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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