Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff3f897ed9dded2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 09:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 353c3ea6cabd9559903fae5088d2de20 SHA-1: 07e0fca7b43f9a5a27e91cf60ce61d4ea491d6a5 SHA-256: 7ff3f897ed9dded225f64140624ed42f7db2eab9dbb83c11c09117f515fbb893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to facilitate initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=metamerism+in+annelida+pdf+download PDF link annotation
    • https://bravo-hk.com/userfiles/file/31222873913.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/buxorokojewoxewafu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbbfe1213e---fekawuxopaxevuxobuwifagun.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/nabikodofosekesadubur.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b50a4ae736---ferigekamute.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160946951587d6---90540413480.pdfIn PDF document text
    • http://llux.vn/uploads/files/80328226014.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a49faef89e---goroxikanokiba.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/ravekinere.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/37851404865.pdfIn PDF document text
    • http://besteva.com/upload/files/80516029106.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/90833968305.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/militanefozidalef.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/85710725590.pdfIn PDF document text
    • http://renovator.cz/files/file/vasopiwoni.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/gamalejinenopapobuseben.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210630164357.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf43c7697---75304060664.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/22775849172.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079de46a24a4---86548433717.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161058c08b13b0---towevibaxasoduxode.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f88580a8e---75047657884.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/63036527272.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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10736 bytes
SHA-256: f635b4683831ca9e351d34b60c8134cc30187d2b54d41d3bf7a1812c895913ec
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 18548 bytes
SHA-256: 96a03e65e284b14d8b6e440dcec3785a931c5e4480df4c379bc9a00cceb9c0d7
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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