Malicious PDF — malware analysis report

Static analysis result for SHA-256 9658766700d159d4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 22:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64f678fb224eadec752387fbea432ad2 SHA-1: 4326be8638d908a0ae512b9f640b552327b95c04 SHA-256: 9658766700d159d41c5a3a17c667be1d83dc83bc549fe969baae56763af9daf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery mechanism. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cructi.ru/uplcv?utm_term=live+wallpaper+app+for+mac+free PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9ca1c38b---lotajakewarexi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/9033119948.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/vowuji.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ecadbee---xawipetoduvu.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/38180021141.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3953a4499e1e2e5b5a7e328959781c91/6366945649.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-04-22-55-56-dQHcDQsI.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/ronowidegapemuz.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/33123472227.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/tixapene.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/5301858937.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/punalexovojiwimowareraro.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/defomirijizasuded.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xemar.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/giditosixapudozixe.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/60883602076.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/novipodirowu.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/21866238707.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/84964410377.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/wokituvoxet.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/nupiwatuv.pdfIn PDF document text
    • http://ud2-140.com/files/wonomakedatoxopiresatefof.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/bidogarilujogipetifesigaj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131520a6e7a1---xagobefexurusamusiloja.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161398eaac4257---95379306265.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/ruvafevegi.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///55447756719.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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16908 bytes
SHA-256: 53c083efb6532e1e3c4a91ed5e2d47066b8349b92de325a63ec2cc916db70266
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10380 bytes
SHA-256: 10983a040b2f6b200231d8ca13b7d324a49690dcce9cfd6e64ab2be1169c1e74
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1