Malicious PDF — malware analysis report

Static analysis result for SHA-256 7675d1aa3ef0d6e6…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 04:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efdb44a3aed425fbddb7370b280e1306 SHA-1: 9a9ec5c34263925c53886cc5366d13fe35c10d37 SHA-256: 7675d1aa3ef0d6e674d6c9cb2d9f56d94b6556139015ae12b43c03c07489c15f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI links and compromised CMS upload links indicates a potential distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://masterref.ru/editorfiles/file/wotixemitifunimize.pdf In PDF document text
    • http://ladyqueen.it/userfiles/files/kutesomaw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a608707e44---67004046287.pdfIn PDF document text
    • http://z500.si/files/70548322905.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/42708870647.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lewisenasifevefijufavorub.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613400d40e488---36569002602.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bafogavoviwolij.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/36067098529.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/bajapinixone.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/vomowuwejavogodolo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/sifubokolurisowetefeloso.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363e6419203---sifokubezibikasibopemof.pdfIn PDF document text
    • https://yodobashi-church.com/13179131001.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/70348727432.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/94719632928.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tazowesuburisawaluroz.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/muvugaxak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • https://onlinendttraining.com/files/mexejezinisuro.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/77547968680.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/dovinaxijasezuxiromo.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/mezovuvojinoxefusow.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/15695016575.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/tufuzubulefiforodu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/moluwijawiwifif.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613929a517f9f---1945801624.pdfIn PDF document text
    • http://bronia.org/userfiles/file/97744671169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+v+download+apk+android+freePDF 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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10604 bytes
SHA-256: 27cfd02ba96cbdd8d457c1126e67a0fc25546df167a56d0d98bd1accaf52d276
font_01_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17896 bytes
SHA-256: 93a3d134d6bb5a016c318a4cafcfecd4fc789dd1e2ce812afd98e90936ecda2e
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1