Malicious PDF — malware analysis report

Static analysis result for SHA-256 c260b3b962d14497…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 03:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e066e417e55016fa5e524989192a80b SHA-1: 9be11e5a457b6bd165f083d2e0c5eabb74f80a31 SHA-256: c260b3b962d1449727aebd8e9c259b40219ba7dff5e374bb12d1217130c87757
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kapsalonvogue.nl/files/file/52315980134.pdf In PDF document text
    • http://keemunblacktea.cn/uploads/file/081809308800.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/98890781271.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/loxititepabebesuxataz.pdfIn PDF document text
    • http://djapm.com/userfiles/file/3002479571.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u2fu99fq3e0i27uoatgpmqtsqb/2571237868.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce838e652---fibezojefifivawojeruvas.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/19709266636.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/9153427694.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/muwulirol.pdfIn PDF document text
    • http://baove247.org/upload/files/54975905667.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9ecc95e6---zogivurikasijeba.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/30839668474.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/belafimusijadififunenes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde03d0f26---24540003840.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/fibum.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/25103553959.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/32626869421.pdfIn PDF document text
    • http://badgerhillfarm.uk/67441388775.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0d16d9c88e58add6a777ed43baa5be04/44760515151.pdfIn PDF document text
    • https://mollis.rs/files/19763215018.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/zutukofa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea474c08bf---wujamujajegoj.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912063425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lightroom+pc+apkPDF 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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 10420 bytes
SHA-256: 7ec36129f506d4e1303f8a5f2b34563ad1865d8f39f2dc94403e7d059114bc2c
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 17776 bytes
SHA-256: dc6e21eaab8afa474399b3dcd4afee918addad23a66267bb7c42cb3917b7d5ff

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