Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2216250f96e321…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 09:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47e170bd00c03f6c5678a722276bff3d SHA-1: 49c3a67737e490473669e2684e46a984b636a232 SHA-256: bd2216250f96e32124dd7bb3cfcf796dc3a95b9acf69bf63fbb55b834f6ae6af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://proxima-design.cz/files/file/derufe.pdf In PDF document text
    • http://asiadomainstore.com/userfiles/file/26456009458.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/64692614190.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/1507599824.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97cecc6c7b---gemivuj.pdfIn PDF document text
    • https://badoza.net/userfiles/file/96070434199.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21d330452---94953290951.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c7b88ce2---nobeno.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/29060509568.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/6837041574.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/fufuxeze.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/giwibo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a29ca60e---6052465832.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/24821009884.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079c107e2fda---bepoxe.pdfIn PDF document text
    • http://blueyee.com/upload/file/270431176196.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/64901403018.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/6413217450.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160771c595717b---85947060810.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c289364648---wosositojirorudilunimiron.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ab541f7df---ralomewaxeronixoso.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/tibawur.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160949d4cef4ef---nekatikonezulodekopuga.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8343778a45736f7f31e67ce898285c8b/19567234405.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8ce70fc9---xeriza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=judge+this+cover+brittany+renner+free+pdf+downloadPDF 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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 17872 bytes
SHA-256: 93fdd7f2a57d275e67d5d5ef98b4f40365e7c1465402dbc882abcf66168d0097
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 11396 bytes
SHA-256: 8257b1afb52e9124238ea9927aaf3fc924c7ccf71eb3ddb6556a6ef5e1b51a0e
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1