Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3e6f553ddd736e…

MALICIOUS

PDF

85.0 KB Created: 2021-08-07 12:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ccf9c79dd0fe2d0e3e766e5b3e92ab9 SHA-1: f9e2f6bf0c186aad8b2f2f1dfce18b437a76956f SHA-256: ba3e6f553ddd736e6bb42cf6a45e6f63ec063901c829338400f6d7ffb5c9f0d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=download+hp+un2420+mobile+broadband+module+driver+windows+7 PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5b6eccf884793ff58904760a51c90993/40140031283.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/nurobekepemoleka.pdfIn PDF document text
    • https://irantruck.ir/data/file/45045369728.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rledr8r4b89fhpeh7qdapg8v04/70570960360.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/69ea8cc7502a9651c354453b223be6ff/dapewof.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/70767404102.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a7cce1d049a26b7878661ef5413f71b3/xefakita.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880df49b73---bopeviduwowitegu.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/nerajirupefu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9feb888a7a---64286496599.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/742f4ffa0b299d706c08a218701d5f42/karog.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9522d99e05---bomitojipu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d9d4d0db---xazajireboviwomoxizinepal.pdfIn PDF document text
    • http://gtshotel.it/images/file/giruxekopupivasobababub.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3jq7981rha6ejbq1lf4b64q2i3/16733805240.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/dutixajumujuj.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/luxurogoterijupo.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/88295145793.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69eb2c5e4---83058361334.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/sipimodu.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16916 bytes
SHA-256: 76745a3f470a2ca737dedcbc25314e1d23f9175cd59db642586a46462fd08ca1
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 11320 bytes
SHA-256: a256a5edf86068243949c4372c67ce0f18e3929d554a913145042aaf7e61c796

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