Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4781f7c0e36242…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 20:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19a4435172b5ca28dde304520ee93cbb SHA-1: 9c8c0a289ef3b14d359d142249909f787279141d SHA-256: cf4781f7c0e3624267cda7721d202b4f03e8c90fd0b8cf76a4d19099d307529a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a malicious second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests a potential for embedded JavaScript to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfa67c9ed---wusarixugiwamiburivuv.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080b17007287---libesibelesoxigobegegot.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625d8b94ef---94347379592.pdfIn PDF document text
    • http://darec.sk/files/files/37154126299.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca4a4a1b---zozukazetifubapisel.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/tibivimis.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a060a7c336d---pigerenibisutuno.pdfIn PDF document text
    • https://susta.vn/userfiles/file/getitemefesa.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/45417412798.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/39923296564.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/rujapo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fosoviliravixarop.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9e711565366aede6f172d4a0e2328552/gulitujinedevaba.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/t4ov9npsr7bhvrjs96c2eb82u7/luvowuxef.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c468450e2689d57137b36aa46652c73a/vemukedunozolisogisumi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/36379099116.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de01dae7d5---86604605533.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36b3e6eb60---fevovitelo.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/nidikejalitiwapixosasisan.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/84527216688.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/77851757838.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/37916112946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=learn+to+play+bansuriPDF link annotation
    • 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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 19224 bytes
SHA-256: 12654aa1905dcdf021b7f075c67bdbd26a7d116fba898c464da00f092ec9beea
font_01_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 10556 bytes
SHA-256: f8a1ed7efb333ce51ee527a923a40a3dbbc2b2d5a52ed4c32d396062adc97d11

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