Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3a2b7bd2c2b43c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 03:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 614040f6e83df34c757533c06f30f70c SHA-1: ceb755c9a12c90a1a0f07fc98785258deff44789 SHA-256: 1c3a2b7bd2c2b43c7cbe5823c7dcc0b8b1f5d11b2c6ed6b51525bc6dd259f4c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=naruto+ninja+storm+2+apk PDF link annotation
    • https://j26clean.com/upload/files/renonuvotatofumefixefo.pdfIn PDF document text
    • http://airzo.net/userData/board/file/zuzakanazev.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/manapogizogosuve.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d7a3cf72---mamofilezamawo.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/57709590797.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3f451d72427e983721fe0fe6293c2054/keragirezaduluwigogona.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/selamuwemesa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e1b50cb2ffa03ea0b755480866272ab3/52583941586.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/sifave.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/witaseza.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/8429449111.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/50333958348.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/fapavok.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/kefumeviribolajarinetub.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gakunijiru.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b47cd3e8d---pebagubudaledubejafejen.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vdu0s41sg1lmon6r3kndjete4a/12805639515.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/50682770053.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/xasatemewijesumib.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/piwusujusemuzi.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210912162832_dns8vh.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_C9000659130E519A.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/vaguforugawukowonuweg.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/370506322.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_off0000c27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27C 16988 bytes
SHA-256: 0c4b8f7c9b34bdeaf1b1ef7a3dd4edcb50f4545f090748d3752f0f78c74d83fd
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10656 bytes
SHA-256: 711da4457f1949e71305e4f920ce7c45c55912e4ed1d6a40eb442a56262fdb34
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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