Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20ae6dbdf5b2b64…

MALICIOUS

PDF

88.2 KB Created: 2021-07-13 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed08c67e100ad55f573a4cfaa0b313b8 SHA-1: 46aabdd24939d01f31b2b65a9e73a14ccbc7be78 SHA-256: f20ae6dbdf5b2b641c991f88138f1941c0b2c883fef5558bebfb7612b26c16af
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm or redirection mechanism. The presence of 'cmde1acui6lglp8c7hpn/kexejezuwap.pdf' in the document text, alongside a URL, indicates an attempt to execute commands or download further payloads, aligning with T1203 and potentially T1059.007 if JavaScript is involved in the PDF's functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pmcp-avac.com/files/upload-ckfinder/files/13265058311.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/120cd0477650fcfd4a9d44898a7f26b3/dukeg.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/zizaluponududogavukuge.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/lph9rej6jspvbb1ukorfeihc68/57935522565.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3199f1f013fef4efd5f2c5f19fbbeeba/77675667895.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a9b6b4eeb25cccfbf2d528a4cbff5cf0/71483067484.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/54e9d5d1ce5d3baf33caa5a8fb426417/semup.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7636b24b---37543297847.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/begorelo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d43d88d43---39339361168.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/79204740128.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ffc8784---wazal.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sdo15ecmde1acui6lglp8c7hpn/kexejezuwap.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/38f51e1f68cf448774eff7cefafd9794/63083340122.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7h987jlbdp1ike30lacsder1at/56573994085.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/87069153470.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae61e7abe4f---jutubekevojotolexiwoxewi.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/tumix.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d5e58c5a7---busafukumu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0d6702dd4bc9d8cdd166cc61dc8de58e/bovufekilagesawuvado.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/sevuxenalemowaw.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641d4f4062---laxigerelulevuridejiji.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b27d69b6---rifirarudulopexupoxin.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2170550ceb4fdf72b864647d89e06414/xefulofazoxipitoxij.pdfIn PDF document text
    • https://teplitsyoptom.rIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=biblical+meaning+of+teeth+falling+outPDF 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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 10808 bytes
SHA-256: 54ad0fd4935ca252888f56f7cfac759b27dfe25778fde1d29a6c595caf241ee9
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 17180 bytes
SHA-256: bd5744872599e68cad0346bb1acbffeeefac25f7515c1c637b963a2ce506a388
font_02_sfnt_off00013b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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