Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f3e177679dcc3d…

MALICIOUS

PDF

97.0 KB Created: 2021-09-04 15:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52ac5f66c5d37ef12ca83d0284c00a47 SHA-1: 4441575c081301d79c1ef9f23da8392c8b146c35 SHA-256: 94f3e177679dcc3d31ac753163466c9da7a47f0f83a671d40b19f85138a9fdb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/67794094405.pdf In PDF document text
    • http://ballmillfactory.com/d/files/soxurezegebugafunoz.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/8566122514.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5f2c35536---85094908213.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8a4db4e19f74bf82bcb59608b02e0221/limewitegumizaruzu.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/dudadolabugovugativid.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/69117941906.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/xefasava.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/fb9083120e72edcd311972208dd0a4ac/30155323900.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ffb310484---43108020801.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e0147afabb9c1ea34d8769ea0290bb57/femusepanub.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/91114a2fab6255299ce7ac111d591a5e/87558335643.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/sizenavebiv.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/raxub.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o713drkitfh4sga4hbdao0ggtm/vasak.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1e2039a22364b77509fd4871b024d0/sowenirimewi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ijamivilikavemewunopelu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b46aeb2e7fcec8d42e8c2aee2bfd5791/vosegogexusikegejinavoraz.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/27823715612.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/1107310838.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/73897553400.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/mabefitebowufenifuki.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/jotorevegifatebavidad.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6b0cd99d---javujerasexovulofap.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8c4b380fb3d6810fe7cf8acf1e990266/kawovafukusazuvu.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/difodazezijivojewinegaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=managerial+communication+notes+for+mba+1st+sem+pdfPDF 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_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 11248 bytes
SHA-256: 68f405050db5c910cb33afcd7702b2f3c72a64c1e3bc6cf62c3cb642308054b6
font_01_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 19516 bytes
SHA-256: 4acfd4e068c8866538e7c59aa2d4d32ede08f6b1b0b3fd8ae22735faab0910ea
font_02_sfnt_off00015da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1