Malicious PDF — malware analysis report

Static analysis result for SHA-256 1900b01cab819000…

MALICIOUS

PDF

98.8 KB Created: 2021-09-03 03:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e21eb00413f95e76e1d87603ea92ad89 SHA-1: 3504199f51a0783ad2c14a0790c0ff9b8236a3ff SHA-256: 1900b01cab8190006ce3d8443082ed363b2822de24edafdfbc3ad12990820894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm designed to attract traffic and potentially distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/814b4f557ea246674e1775d436b81aa3/famozaragabudoridoz.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ecbd7c776---nebijokalokagalotazi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/34090699744.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/ximetuwuz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e3bea8d8---sulosunitopodupadazi.pdfIn PDF document text
    • https://samtee.com/admin/images/file/waponebo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926c876dcd1---6208041781.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4477sgbh0top61bqil62v9op8g/66471013239.pdfIn PDF document text
    • http://watch62.ru/files/files/fasajadosonuvenijesinevab.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dada4452b---fatodabavusik.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/77444861180.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cb89afccd4eba40984c311c8b5505dd7/pufub.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/napapobe.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/743dd136e0cc2c0fba5eadc97c10c2c7/fopubarebikoja.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/70758280255.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf0e2ca6d---tamutifepovovolugos.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/fegokodobekuxovun.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/fiseguj.pdfIn PDF document text
    • http://huefpdf.org/upload/file/tiwagopofafezi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaad84f271---70769306165.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/xuwufowiremefusen.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/sulizuje.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/jetoren.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/liruguzigadakukudidor.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/midaze.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/22/8054835703.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d69152730a15c9364d8e61f9e409056a/76457998452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=imrad+format+research+paper+pdfPDF 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_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 10592 bytes
SHA-256: 55d63eaf22f9f8c84427c07d33eff4a2fecad218419898819b66f9684e148e5e
font_02_sfnt_off00014e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E17 18152 bytes
SHA-256: 8f323b5ed54a4ced0d336ba6e79a37fed1bc41be0d7d8b6f144fb5e022470021

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