Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c7b74a0820c875…

MALICIOUS

PDF

89.2 KB Created: 2021-09-17 11:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6346bab268ade6b17de2a811c2602514 SHA-1: 646025c5fd28290059dd8dcc0b72eecbd5653849 SHA-256: e0c7b74a0820c875a29061aba8863b2bc3904f73eae0cf8fb2cf6492d3d1681b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=mobdro+equivalent+app PDF link annotation
    • http://sity-luxe.ru/userfiles/file/84597630793.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/zokujiwibejed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d27628882dfd5088bb35cb015c4a8edb/74294837881.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/87067773602.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614163366e848---17422970792.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161422db753bc6---88961097014.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/86403306075.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/11002479685.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/25231895682.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/wisakajakazezu.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/turetane.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/zomegufimifadi.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210917_145007.pdfPDF link annotation
    • http://noithatmfc.com/media/ftp/file/tafoduvaduwunolimebik.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/rorobemot.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4513e1b4---31650923434.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/31415254798.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/42335939225.pdfIn PDF document text
    • http://kelsenator.com/userimages/gagudawomi.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/12144430959.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/supebi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161402a577d24c---nufegugoxeg.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/91817206990.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_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 18248 bytes
SHA-256: 4599f3894e54ff923f03c3de9571724f356828aa5f50401e5966fd8202a09b7b
font_01_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 10660 bytes
SHA-256: e63e59ce4c3e367962003d4f45900d83f9bd6a25e3ac130c3bc8f0983d0af13b
font_02_sfnt_off00013f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1