Malicious PDF — malware analysis report

Static analysis result for SHA-256 612aae4a9cebc702…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 00:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f31b5ab27c478b2afa0f039af6faf4d8 SHA-1: fdc17853001524af34a99d202b8e0920387873d1 SHA-256: 612aae4a9cebc7026b7f74e4b600a15bd3ab02d2caa57b641b6c1e2f30118289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dzstock.com/Upfiles/file/nanena.pdf In PDF document text
    • http://jonkmp.nl/img/cms/file/fujasunonavakidodup.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210912190955.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e36fd75e5---loziwuredow.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d1b9891e5---32061971482.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420103831fe---repavekepej.pdfIn PDF document text
    • http://gibisch.com/files/files/19694863767.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/joduxexalemavobovakut.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/34110747872.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/pinaronuruxese.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/31109317372.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4418579358.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/dosorizetusepasolu.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/83333106403.pdfIn PDF document text
    • http://philipsphotographystudio.com/95085970042.pdfIn PDF document text
    • http://wernitznigg.at/files/25006152549.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/79877218541.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/jusobimeluv.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/tolosibavido.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/26849432961.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/9511449225.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/tefetavirogiwejuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+gta+v+online+downloadPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/zesukuzubilosogewo.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_off0000b200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 10384 bytes
SHA-256: 40762c91550a79f45b5bb19ed8fc8278ed8bd96ef926f3786fb75650a9dbe44b
font_02_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 15332 bytes
SHA-256: b0d5687e6e5562d327f206e54241a639f8ef62b6f69dd6faceb0aef12c05791a

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