Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b90917b0da7e9ea…

MALICIOUS

PDF

113.5 KB Created: 2021-08-29 00:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9bf61fe27eac4ce66238ee46e870e09 SHA-1: 78ae9b343737b40f2cef919c93f5653d2cafba84 SHA-256: 5b90917b0da7e9ea2747897e789a684a4f9a20fd014c884d3d97782043f627b8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or distribute further malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca2c74e51---64731184211.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/853410a2948d463722647ff0be267b80/46843496493.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/849414f92e5fa18fb2887689c23662f6/40135125500.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/gabekiti.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92659d220---21989545177.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3871072024d7985a98e619beaeb83df5/22981824903.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9afde14a---nukibemujivuril.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/76160356287.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a6ae3440d5e19d02285f6ca6947fc4d1/5420580155.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160873781278a5---ziwowukomuwomodidaxanotel.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27dafd539f9ce26eaaf7231feea3ef7d/60385313909.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/suvibekoletiwevabis.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a91fff14b3508dd442d225888c529b12/nutomimumo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335e7bcdc2---198612631.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f85131e92a82afaebc656e361dc9abf5/9182163609.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1l8is5lvptrk1kg3dkd39ktij5/17886571758.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/q193v1un7leh6ecq6u9di65849/lomavogafoxa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/23275069543.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/boganozobewoteginobatopit.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f54c00611ac87d6c53d80c35c565f9d6/xunufofusowuxop.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/88091844004.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/mugezawupepojemokujepir.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/gizofosi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6c54304b---68630357081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+lorax+movie+questions+answer+keyPDF 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_off000151f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A08 19720 bytes
SHA-256: 630a15072f773a6ac1f3d12c6388782008059dc6f34e486bff5ceb2a3905ca9a
font_02_sfnt_off00019d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D74 11040 bytes
SHA-256: f0f20a496046148b0fe3f73dd3be5870a217a55b37922b2aafd2a2df6c0e8f55

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