Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cac965e19fb40f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 01:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a2fcfc1ab0c4dcd8b6765011e113d29 SHA-1: 196897fe2d8e1d929f7161372b123f736748da55 SHA-256: 77cac965e19fb40fa5ebad7cfbd9b235a7c3b5b95396240ee823d7f986aabcb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to compromised WordPress upload directories and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=pubg+videos+lite PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b1c49fc5---pipegutatufafaga.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/17963258866.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/32285037137.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/92677550927.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/35960350358.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nadab.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908230601.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/65874532140.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/xokatakufinesenawiborozu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161403f7937cb7---tajafigovejitepi.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/13202899233.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/rakibatafipalunolosawata.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/zobijatevutaboxad.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040226557662.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/79d776b99975535713920ea396c5687b/81677300782.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xazim.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/degipuxunuzo.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/51206784190.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5221140f---92614813388.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/valutewifugusoni.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/xeduv.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/34915804559.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/63934427949.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/15796198525.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_off0000b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C5 16028 bytes
SHA-256: 04a241deda518ac19d8ca58413705c852f45552ada8c7064fb1f814f8ba04177
font_01_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 10364 bytes
SHA-256: 944f86926bb3211b2c8fb61139157ac56b1b1641fbcb9d7523929079e00d4b57

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