Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b8ea77af76b020…

MALICIOUS

PDF

98.4 KB Created: 2021-09-20 08:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4a79a73f5bcdf83e4e6dd59737e5a05 SHA-1: 446d0c35f3d710fbd1c4aa9a6bfcde45189daf31 SHA-256: d8b8ea77af76b020554f1a772a0b2d7bb6d3a34b2f0c85f4c3e500f7da0cf903
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to attract traffic, and the ClamAV detection suggests a phishing or trojan payload. The embedded JavaScript likely facilitates the download or execution of a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • 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://archism.ru/uplcv?utm_term=unlock+pdf+form PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161460a5699b96---zifolodu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3d165134---lekas.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/49104247334.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/68667123364.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/bafigej.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161452563ab071---tamofefika.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/vumimamoduzotebo.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/genunorifokanodovelu.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/tazojaro.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/ravugupoginojo.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109032159038073.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/88963912729.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/sukojeb.pdfIn PDF document text
    • https://kaparatt.com/images/File/tedijati.pdfIn PDF document text
    • http://pedraferro.com/files/files/19080122130.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ddd9ae8aed021139e50d2ffaf5dcb912/62793456053.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e6829da---tejubakarubezuf.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/rudisofovorexodutavovere.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/68478043571.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/8059684150.pdfIn PDF document text
    • http://klpa.net/userData/board/file/63253404895.pdfIn PDF document text
    • https://priscar.com/documents/files/jejuvenuxutozuxuvis.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/nepopixe.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/27020311449.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_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10228 bytes
SHA-256: 32d5e2e159eb7c9bc2b63eeb006996c0425314ba8d42ed0ec039902df539be0b
font_01_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 18224 bytes
SHA-256: 056c57f0f0aede6260eefd0f8c58f4b1023f68b19d6555d3359c783b410f0844
font_02_sfnt_off00016498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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