Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcea281e78ba279…

MALICIOUS

PDF

96.8 KB Created: 2021-06-11 11:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b6386057f654c9b3e16262626810caea SHA-1: 07b8c122d94cefbb0733286a9e1dbedb923f4041 SHA-256: 7bcea281e78ba27965f21ee6ef3bd1168f3f68735c0c96c24bc94f93d416c47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=free+malayalam+kambi+novels+pdf PDF link annotation
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/cd43ae82fcbebda11543cb2179ced0bf/38241952759.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210607_065907.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/l57jjfph2ac7j4t4l2pnan1at2/gurikani.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vufoxizededewepenolopovek.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f06be323d---sugis.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7c77ff68---fufedafaw.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300d8024ad---67127196003.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/wonuvirabajexorojomagas.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a9497b6f36e3e49845c278b245427a61/38488949266.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nolejidirawopused.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b45e210d2acc4e947ffd223bff1cb11f/zidewakegewitami.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/relotasozugov.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/22787564118.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf08c58c0c---morasidowezipokatorurap.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f862.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF862 31996 bytes
SHA-256: d9cd3bca42ce3508db82dd5614d8c2d9621b4b6cec0a25ba66238411ff3fb381
font_00_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 5508 bytes
SHA-256: cdb80cc145571f5854d03b35530ad470979a01e79db573c2ad8d57819ed884ff
font_02_sfnt_off000150ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CA 10992 bytes
SHA-256: 98751fdc6028a23c91325e564c901acc506b47bb6e33ae41e5efe3dd45c7d955