Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb09e12ecc3ae50…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 01:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edf68f85e275ed2d8dcd508f06f850e6 SHA-1: d2fe5358531dc13f4ca7fd152e72c1f632a23df5 SHA-256: 3fb09e12ecc3ae5013e4ff4fbe58181ed72fe2f6ed4fccac2aa28f6e2ea977c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=modern+philosophies+of+education+pdf PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40398131281.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/sizadawuxi.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///sigeboseretibutigagojelox.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/kezob.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a83e1de53---11512977424.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/rululepudamesupadogilugok.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/24411883858.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/58755112999.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f12b5a3f---34753562328.pdfIn PDF document text
    • https://soechi.net/userfiles/file/fexitunetibojovuxe.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc83b68a206---fifibiwo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/dc9eaf7983749a58a2c0503d5f697f41/wiraxozizipiluful.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/13245884168.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/52307671595.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/54052889d9753015ce6adecea0379769/57273281099.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/falifemulaku.pdfIn PDF document text
    • https://almavilag.hu/files/files/ximabober.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/87161988883.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fbc7628a43056c3d2b319602a9754247/resexix.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/becd93d6f863d933cc52c95111fbf4f9/ditejuwumirevaz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/134ev895tv43koev648bb5gs5n/buwukixafedova.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207534ef64---pisefabujifawomiriw.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4ab55b198c22d25491ce7193a82eac63/82962914627.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_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 15604 bytes
SHA-256: 4201d80356a334906730349685427cb6239c1b5a2f04e547d9b2dff10ce60ad7
font_01_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 10812 bytes
SHA-256: 904dcfc727fd3ccea7f92718e6cb976829d08571f0b1f9a3300d40ccb5badeb1
font_02_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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