Malicious PDF — malware analysis report

Static analysis result for SHA-256 a477bbf27df0c238…

MALICIOUS

PDF

63.6 KB Created: 2021-09-16 19:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc9bde8fdd9cc8b0ac2e97fb1e73c0b3 SHA-1: 1fbcf0bf014a98e78b2dd9f463a116a883200192 SHA-256: a477bbf27df0c2388245c909ff33cbb2402e36466c3f1ca78038a2ea104da4f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators suggests the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6756

Heuristics 5

  • 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
  • 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://sdes.in/uploads/joresimadelofowiguwej.pdf In PDF document text
    • http://nandishoverseas.com/UserFiles/File/vamitozakubimud.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/79355002783.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/8330168344.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4a16ae097ac5e4c7177bdcf95992d14c/lulenopimugumo.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/tofivigakerimesepoxonige.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/56438498081.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133619283734---kazagazevuninafoxuk.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ladaziduwukapan.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/sabuberemelomawiz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0ae6d726---3222452363.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fudativojodapawepewoji.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jifobolarik.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/lugevozebozolutuwexovix.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/60095227829.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/99115711830.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/sorujizulowisuxi.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/40814873545.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210901141002.pdfIn PDF document text
    • http://halmar.info/userfiles/file/gadaniguluruwe.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/74343539507.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xejodusatisinawebox.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/24ocrtugngg1g16fnd4k6hkgkj/lilukarutifodezoduzopox.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/zumexa.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sogodux.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/20422118669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=english+grammar+by+betty+azar+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 11124 bytes
SHA-256: fffc8bc981f497494044da056e752d88cc4091e251d41057a34f29368c3f09e1