Malicious PDF — malware analysis report

Static analysis result for SHA-256 b388639a250e0529…

MALICIOUS

PDF

85.8 KB Created: 2021-07-15 22:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7c452311e66c50db86b65e581066a21 SHA-1: cf6ada91bd1bda3632bf88134bf597f3714f3428 SHA-256: b388639a250e0529fc8af43536a808025a269e5dc211f6314fb12693895b0d0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including an ML classifier and a specific rule for advance-fee scams. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://bselink.com/userfiles/file/21531110423.pdf In PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/55756207291.pdfIn PDF document text
    • https://fultoys.com/userfiles/65416407101.pdfIn PDF document text
    • https://magatek.com/documents/file/putelufele.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/divag.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nsbg6rb3nberllbssn979jpmc6/nozowegowe.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/zikatoja.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/vediwab.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1s2uc9ujggn9jnd52michjsfss/jisewamosonowabate.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/34135653915.pdfIn PDF document text
    • https://plasy.com/uploads/file/99956210484.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3l0rf9fju9fluj6hvaa5um9eo5/jijaze.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e3488c28---pobemeporox.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/un86n8f8pgkrj8v1ak6fh4dmt0/1000349741.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikutu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c61dded8a7c49808d0d7d5494f669c42/16635687887.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/77715989830.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/dusenagazekudejumesediz.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2f5ae7bce34a491c5665993bace7be1c/rabuzemerarikediluvofome.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b286a244a8---29896731953.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/17742350366.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc05fe3d74f---gekisipeluzoladiwaki.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/9857300043.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/2413571565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=thai+red+curry+risottoPDF 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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10492 bytes
SHA-256: 113354b099e26b7d3e466c94068d37f05ca22806db9ab9487e0b30489b20650d
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 17548 bytes
SHA-256: ec7e809b656b28ee0009c5b6565dc0dcc8008dd5abb7024b71eda72e2b6dde81