Malicious PDF — malware analysis report

Static analysis result for SHA-256 52be0e3f59c771aa…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 06:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9259e8006094dd760e62c96ac0559da2 SHA-1: 15f810127c1b400ed2502238dafa8236255cb909 SHA-256: 52be0e3f59c771aa9b3ef8363dcf17a7ce1b1c6840c9a81a6390f806210699d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, although not directly executable in this context, indicates a potential for further malicious actions if the document were to be processed by a vulnerable viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bakefruit.com/uploads/files/202109102207589697.pdf In PDF document text
    • http://www.toptehnik.si/images/joleru.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/30634844798.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/kigewubidigejilasakod.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6e3978d1cdcb85bbac41537207e3505f/netesobalizama.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/disavimosovakenane.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ea86abf7613daa16d662b7cf2d764f2e/devugo.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/towawakavaxexoxumuja.pdfIn PDF document text
    • http://artepcb.com/upload/files/22265735550.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210914_AA83FBA46A5AC5AC.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/26847941256.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/88840123560.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/jevosidaf.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wifera.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/63930171513.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/90810924227.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/wuwoj.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/dajusiwamolize.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/12169565412.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/4511060785.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8a878de2---40572553764.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/pegugidakinojifarobafim.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/4063275240.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/6c889151d17c2b3a97f95d72a0b19245/tujuliwijijedanod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+rename+apps+in+androidPDF 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_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 10584 bytes
SHA-256: 7ec7e912f2964b83d0ed0570c90f1c445766fd4a51b4d77f7853321f0615f762
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 18056 bytes
SHA-256: 63dbd31183b556a281fa6bf2c041b6aa4a7252df5f835c8557ca4bb9223a7f3d
font_02_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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