Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc518bd0b48419f5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 19:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aef70b94082bb1703e89a6e9f112d94a SHA-1: 3637390b1c207d6081130e5f34f47840b4af1b94 SHA-256: bc518bd0b48419f574284a10dfa7328ee7117d5b2c38023bfca49788482ecfff
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, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=comment+acheter+de+la+musique+sur+android PDF link annotation
    • http://baheth24aqari.com/ckfinder/userfiles/files/17475265630.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/63614571525.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3559c9a---wufakufululesuxusogelubu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/28410270837.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16140588a9ac4d---vopolekixa.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210915190918849612scxvp.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/zibuxenifetina.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xiwijuradape.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/35511894079.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/guzomifojijelasaxikovar.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/6508194092.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dcb7155e88afc3eb90a08ce9d6861869/sojafegufadoxuvejamola.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/balarurufosub.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/tizujabe.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/8644078281.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/33882687087.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614141dbbc3c7---velulafuravijalezafedufo.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/96449310049.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd425fbda---ladenu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/48593904233.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/dexudalezobilekoge.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pusujizidolag.pdfIn PDF document text
    • https://ms02bet.com/contents/files/rakezutebonol.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/xurakidubebitijopiwunugot.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_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 10912 bytes
SHA-256: d67714171f8aa14ceebb3d7eb8f824510ba3ea3aac731d5920cd012a1c2a6325
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 18844 bytes
SHA-256: fd506554679fe5bf3e9e77de0bb1f209b6ecbc3807412b89cbd2210372ed9966

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