Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3b740d7a0162be…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 20:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd7ad9d2468f5a8c413183ecb459b3d9 SHA-1: 76e8b0a90f03936b553cb921f30b8ba5a8c8e366 SHA-256: 4b3b740d7a0162be9103a54692a00b6ddbd9bcb8dcc512d3404fdc373165e81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2efc69ba1---bowexowige.pdf In PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/jomufedajaxamadebejadun.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb6390aa6---40357948775.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/66025146684.pdfIn PDF document text
    • http://arslanemlak.com/E/file/femubomawunukovunifenitu.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/93519299685.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3udh78qa9bul9shs8tc3q6ouf4/10506576797.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/574fa26818ba38311118ad8ee3737ff7/40039670187.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfa604724c---30669749114.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/tenakojeze.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/64596013114.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8581096008bf1ada95f27e3387d38182/nomedidabuk.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f86303da6---46876825322.pdfIn PDF document text
    • http://siembra.me/uploads/files/72886962054.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/sewifotij.pdfIn PDF document text
    • http://salespate.com/userfiles/file/49151394568.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/40386061356.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/70808907582.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ceb6f5f6---64652007886.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/24046575711.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8b355f2a---wulijizuwofe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dd4fc4b9715cfffed775a1d9c455cd59/96659548343.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/84921974937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=zalo+for+mac+m1PDF 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 9916 bytes
SHA-256: d439655b99492c629e56bff7da905d54091d4be1d0ed16d3f747799ed200b889
font_02_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 31712 bytes
SHA-256: 7da819ffa1e66625572f74bc1ed4af30d223ca000ca99841dd3ad41a349fc90e