Malicious PDF — malware analysis report

Static analysis result for SHA-256 620ac8d21f2bf875…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 00:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a25f65ac0d23efb3371235419e85f613 SHA-1: 226f33dfaa778c400752be8b3b62222baebc6ff2 SHA-256: 620ac8d21f2bf875b90b5800480471e0549ec31b1ff3fc198810e7f31ca88555
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. These links are likely intended to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bdea8b97ce91aafba7015f67528611ce/duwufovitimaberawalenis.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-20/20210620183416103397.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aa9cae169b44f9587a76589bf8376f99/vejeponovip.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/gilinulodabepebef.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725196e03a8---rikolazogivakumi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160821c2faf3f1---18393271165.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210531065615.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f6c35476ae0c747cb52c31edfbde850d/10890504739.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/taloj.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a477a866bc8---30924128999.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a7832cf957b00d88eaf05e408d0daf95/43030986587.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ba2924e9b8642e3d4c3cbf112c27fd43/gomizen.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/62517290676.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9evbeeh97k3abh4hn025km0m10/levejem.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fae4c0e8f46d151164c1a30c502bec71/dalifudafuzofoziwoz.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/97944825473.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/660cd778d0a15258a5192e253dd64e70/42949697731.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e088c0a0---5452025149.pdfIn PDF document text
    • http://axwelindia.com/uploads/lewixaf.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9rvdfct1ciejktl6u84lddnmbu/90912472364.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xeratagobivatomap.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sobalog.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd72289f29---bekenizenulabudewo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c184692b---bevasovemoravokolij.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/raicjm4vb6n0ejnaqg7ejqrspp/pulupor.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505210144706053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=madea+family+witness+protectionPDF 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_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 17560 bytes
SHA-256: 4472306397bfbcaec8455ae89e9f5182d577de7a388c9e6dbdbf79f606ddd89a
font_01_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 10972 bytes
SHA-256: 964fd22a1d6f23de79fea707757e3dec8bc8744e1cddfeb34f7b30e667433659