Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c28b7a1dcaac8bf…

MALICIOUS

PDF

96.2 KB Created: 2021-07-27 22:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3453bb2407ee8f9ffae001ae2478831 SHA-1: 4a2bb2446d343d9983aff1b755045b3499decf2b SHA-256: 8c28b7a1dcaac8bf4bb1a0ea6ce09518ae634229662c0da8cd4a621d10537067
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and a high number of PDF links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://timapools.com/uploads/files/muzurapujulanovovef.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ddb98d4ae---31574469944.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b198b2b16ed9b131eee657f799b837f1/77422506743.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7eb30afa7460e71a232731932f604955/62157139885.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o3hiknen29ct0jds0pu0k1hbsq/95107117054.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/13720777319.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47385c06c---61930261262.pdf
    • http://frezerovka.by/images/fxeditor/file/34772777702.pdf
    • http://artin-intranet.com/ckupload/files/56490193382.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d7b271552---52564697759.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4e1eeebd---47117699399.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d1621142e---lekonavexir.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/65119520287.pdf
    • http://datavincity.com/uploads/ckfinder/files/63449122210.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0462384b6---lisuxub.pdf
    • https://motelandratecuci.ro/userfiles/file/93476449834.pdf
    • http://rasmesafar.net/basefile/basefiles/52734946840.pdf
    • https://abeess.com/userfiles/file/46950122452.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e216ca4d6---fovepotaze.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/dcb5211f0159859824c5fe12603f7820/wofujafe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fab57cfff---gojuxodesirogaj.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/41cb34252d5454608c9638fce66bf87d/30399924681.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0flvfk3pto0al84gntf8fo7oot/kapavudos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+leon+for+free+in+brawl+stars+hack+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114fc.bin
a146b6fc435324b7a93f0fedfad7483f8d5f400cbd2554cc949a2d97f1f8f6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16476 bytes
font_01_sfnt_off00013fdd.bin
f35426f9605844db056e163bd907d45f063ca21b70d5ffaaecb916a4eecff0a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDD 11164 bytes
font_02_sfnt_off00015a01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A01 16792 bytes