Malicious PDF — malware analysis report

Static analysis result for SHA-256 c253e7c7d8cd36b4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 11:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ccc2f3d5ac551bb6d12f46a83e16c9c SHA-1: e8baaf4c5a0717671489b1ba2eb42348fa27ab54 SHA-256: c253e7c7d8cd36b4e9f0f99e5344d217677bb51e10edbc040ee5fceb23aed46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristic firings strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://podimercrm.com/img/files/77400062122.pdf In PDF document text
    • http://hyundailed.com/upload/editor/file/58380545256.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bb63s9q3h7fq35scuqmt3gi9lp/nojodilozumilimorodaxote.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6e3c52388ccf0aed4b58492406e1cb46/bulamazipafugadirezod.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/vuzuloxefeterojujoribe.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0d18fc0a6de2a7c526ad921d20973471/24834408091.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jenitikugokiwinade.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/vusibuberupetanavilu.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/kibatanimawodaxitomuk.pdfIn PDF document text
    • https://shidoremicrosys.com/media/84884258655.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b968cc0d---gokivewosovazuredila.pdfIn PDF document text
    • http://ping-property.com/user_img/files/lujijimobeveb.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/resopilefexidajupife.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/farutujusaxos.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/6507454648.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a321c0df4db---tizisibagajebefimak.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0714b0ae5407a61e74af9734925d4b3f/96292081056.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8baf58a528402dc793aab866c1e001a4/12038300015.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/82dc9d4e716a58a54aef02ce3496086f/24962320651.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7138ab2c9bb7b65aa497a182bea00350/42076936309.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/22716387839.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb92b4f1b18---79961365806.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a4834b19076298daf0afda14b811670d/lapuroki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=caring+for+your+baby+and+young+child+6th+edition+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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 18180 bytes
SHA-256: 3834e5a9d79b03045b9c5f4a18b1aab4f5f8c964dc681bb924370e0d679aa0ab
font_02_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 11284 bytes
SHA-256: 0d11292a5db2646f7c8d1db80c73f2a6927e7c678efd4d07a3124b7f189e7d18

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