Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea52262c9f62bb4f…

MALICIOUS

PDF

87.3 KB Created: 2021-08-06 03:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7baa28f89835206e06b4a6fcaaaa6fd5 SHA-1: f2af6ed26bb9da7e2f1ed13da765a64aaefa55f8 SHA-256: ea52262c9f62bb4f7447c7eb7daaa7b4b9cff5f11a466827a08749b83b60c41a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=diferencias+entre+teoria+de+piaget+y+vigotsky PDF link annotation
    • https://miet.hu/kepek/60286160418.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c790dbcb29---zifer.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/subite.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609624aa1d678---58449266044.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/zekaketere.pdfIn PDF document text
    • http://rafaelokazakov.com/file/xirigadaz.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d7781cdc42e548131b7786ff7b0758fd/43549141378.pdfIn PDF document text
    • https://maisonforville.be/documents/file/xivubobitewodegasisovo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210718/file/16265558075957.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/dujopetuneve.pdfIn PDF document text
    • http://ge-mak.com/files/fakorijajupulepe.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/82227086512.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/gavemuni.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e205d2437ad---panonezoguxetenasajivera.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/wabiriputewigubovonejazex.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/merulizibep.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xinagerujolade.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5oltrj809ll4ki1s5jhq0ra3ac/34051425803.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/69380829677.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8c37de5854307615d54815a4a36189b9/gopanunuxodunibik.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ssi97ok6lfqk3fa26ch0fh326a/73850316524.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/11271872300.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_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 11020 bytes
SHA-256: f24eee04cec7be77ba0ab0ba920caad519c431483126d8e0ed90a552f1e17b9c
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 16900 bytes
SHA-256: 27fddd0254c28db53cf4ca1d985a1c0d4b308b4eb7871ecdb77dba0f846b1d37
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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