Malicious PDF — malware analysis report

Static analysis result for SHA-256 297dff392866216d…

MALICIOUS

PDF

93.6 KB Created: 2021-08-05 00:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c8fd4216dc83e48707f35e0690d1c12 SHA-1: bab25fea6bce8e7d0c36ac02914b3d80fdfb673c SHA-256: 297dff392866216d5bd77911ca421e8391a597419251fb6649d14e09ef538085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards a tactic of obscuring the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://catamma.ru/uplcv?utm_term=can+you+download+play+store+on+chromebook PDF link annotation
    • http://skolicka.eu/foto/images/file/mosimikefusoxeburax.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607271840ba57---31096366435.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/172129264563.pdfIn PDF document text
    • https://capecoralliving.com/media/file/sovabegaxevugaj.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/dudofu.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/39249541150.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceff76aaf1---68251352335.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b74fa6368---fomoxabowujabetukaz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f13dc860---60466546861.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f3b1b4b0---64616625470.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072db9b245d8---70330590824.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/kokavulorofarutajenor.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/47473711210.pdfIn PDF document text
    • http://regcureguide.com/files/files/91492755982.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a872c2db---36397991545.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/julunuxefome.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/77530873816.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bamizunexiboz.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/jidokatijupefudilij.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21e3aa0b5---65858952039.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cee610cda9d---95847743971.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/42589039142.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kulalutojusesidokes.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gezuwivupewotolimo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29ef49392---11772660415.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wexekuragupoxesar.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_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 16840 bytes
SHA-256: 03742e86a5b70fef3878ac5cf76952e14c9c8ce022f8362206427a988fe1d5ad
font_02_sfnt_off00014d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D20 11248 bytes
SHA-256: 847bc9e743b6f893e4e6d27982ac7ede7f449c56ee40284f9ff37484ddec16fa