Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2b6713bcacb682…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 07:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d763728b8933f954c2a17dc782d637c SHA-1: 983df2a789406caf1dede802cf3d272cf2acf805 SHA-256: 5f2b6713bcacb6824baf2e50b0548a7705eb75668eee3e83d3ef71ba8f12236e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/671d6d863f30c20725df0fe1b5af38b2/33006138383.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/5139ab9980a2f5018fea876edb01fc2d/bamogasogusadojem.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/74958859418.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/jegonijeg.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/xasidubodezofup.pdfIn PDF document text
    • http://simonide.org/userfiles/file/geniropasakanapepa.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/12254828566.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/24802064108.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1b21a01d284eceef1df3e02477d90443/raged.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/6661669029.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc4c512fa8---19241802674.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xozilomidola.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/18650402909.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a093a71d7c8---xuguwuzod.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wafavemebotetofavape.pdfIn PDF document text
    • http://biosite.ru/images/news/file/lagowudexadamodufalumikaf.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/17900601043.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s2i9a5jttdg3qdudf5qd9112m3/7007484345.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/17294612586.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/31830183279.pdfIn PDF document text
    • http://podarox.ru/public/files/83741546230.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878e45547a7---33673630637.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac721500882---30298593104.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/tajasajujiposemofosed.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafc96d122---rulaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=csb+study+bible+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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 10392 bytes
SHA-256: b0ad16a5eb9667a3ff87ec5436881840c1185546ecf620f891fff0eccdc76825
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 18712 bytes
SHA-256: 2ada3e6ced2b406860ce38df4c86468b6dd2e058b1844657259945431d6a682d

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