Malicious PDF — malware analysis report

Static analysis result for SHA-256 41afd24cf6db58c9…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5119a1731d938292b603ff1ee1a1f4a0 SHA-1: cf58c9370f96900f3b3051898c6da1dfdbc9527d SHA-256: 41afd24cf6db58c992b36eaccab3d5ebe78e20830b606e7caeabb875a12d9dd3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves directing users to external, potentially compromised URLs, which is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609867b8874bf---nosokugugakusi.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dc3e96aa36cc8f54bf2bc716ba49234a/waxiwovowax.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/masasosuda.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd6cb4678---gugagilizo.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/15725039578.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210706_145EE6A13A584768.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/ralelifupifojogogubov.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fexiviwiwe.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/bilidabuvomagum.pdfIn PDF document text
    • http://emeat.ru/var/files/65780037095.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1624478293.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/905ifn5r9j74v0t272u0if8pk3/kakokarun.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/balujev.pdfIn PDF document text
    • https://limsurempat.com/contents//files/45540935774.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f94a02e3290066649c3a2d5f9055658a/46317199056.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/74746258453.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f609e798d---roxulufebowamanazuta.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/14346990585.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d057d4fe---jorod.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/82915477bbba4967a1ecf9c9a43a74fd/kojisuwubibituwokipoxar.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/892a492e27be2f3150382593ea20a0e5/63592792574.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/gafivapekarizameme.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ddf0301f6218a6f28f40dc9be0f16ab0/zixiwitimasodosakan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wireless+communications+from+the+ground+up+an+sdr+perspective+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_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 19272 bytes
SHA-256: 1b35f0264eff4f69a5ff522d6595c7d4c85dd64fe9069820764231b46bd53bf3
font_01_sfnt_off000149bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BD 11224 bytes
SHA-256: 817a8d2f3dff97bf879d9ac52425d50610a3fe735c68c76d3fa0b3c62b675fc8
font_02_sfnt_off000163b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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