Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce3c7d1d9007e08…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 02:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 847f1645295bcb4df762455d1a42f866 SHA-1: 2c4bf6e5636bd4a7a5c03056ffc44472740310a2 SHA-256: 8ce3c7d1d9007e08977a8e6db16570065d78d99c9781878e5fcf813c4d0890df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF links on compromised CMS upload storage suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abab492c40---fovigim.pdf In PDF document text
    • https://ustunbilgisayar.com/userfiles/files/bexumijitanose.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/5791663900.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/84845889243.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c310921d02---65031833358.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i0gs3rc4eqa5u0m8u74vs37nf6/19648237744.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/15585380791.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf8c29de0---lekatusi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/43890674034.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/26a439089356d61bbad210680d7756a6/jenifemawuvawape.pdfIn PDF document text
    • http://inistor.com/ufiles/files/bekoxejeneruraxeji.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/29236774841.pdfIn PDF document text
    • http://rld-carbon.ru/file/rodebulojakasaxa.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/megix.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0af49e007c4c0a13ad2dc7729205fa92/60989913405.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/dizixela.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/vajusovewigimegiborenur.pdfIn PDF document text
    • https://brod-plovdiv.com/images/muvakumofaxibiwukogu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c954440ac7f98a1fdbfc6a72d4a673b4/76715216374.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/62713995911.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/bikujulijipali.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607663c9e8a2b---niwibafinikusabekuv.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adbc71683---gasujokigevajafebudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sbi+online+application+form+download+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_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 10916 bytes
SHA-256: 5c70822408d45c1688cff518e610f0378cef1b50142f1f0151fb3ebba4b06032
font_02_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 16204 bytes
SHA-256: 53c8dd9c3732f6da8afc46f4e93f7adf083f9dee24387cb088c690a2a94e90f0