Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9ba84baa42f6b3…

MALICIOUS

PDF

108.1 KB Created: 2021-09-05 11:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 574b5709d4e6bcd3a1a7a08f43b397fb SHA-1: f08ad244de886df0f3a3bbde2c1432584f59732d SHA-256: 1c9ba84baa42f6b344039b7948b850c8a4912e3b478ec3cd8faefd1758660b87
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a deliberate effort to obscure the final malicious destination through a chain of compromised or disposable hosting. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff2a4cc14---vatoxukepij.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3io0sccp86ur4mt0s68924f1h3/49493364249.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/27316527651.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/77769126710.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e66ba67e4---11363672030.pdfIn PDF document text
    • http://erdbau-rauch.at/37174009981.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vanikarubaxa.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lufisutenuwawizosefevema.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ulksobloi23mr0os9299ri0v80/26534460302.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be389d63864---netabiveretigidi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3f755fbd---lejesobuwavugogiba.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/69c1f6f460e14da72007644106e8448e/34003386572.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/zuxevudox.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095e006695fc---98843009408.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/46964235005.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908ae4a6314---doxuv.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/xonojivo.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/82487613327.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210619_525624A63FDAE807.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/pujupaperisa.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/38542173967.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jikabujigomisikevilolipo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725557d3f65---pejiparavapaterenoguk.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/tudikuminejevazefipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=condorito+chistes+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_off00013f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15769 19760 bytes
SHA-256: d041d8b513a77e0a7c7b92d1be59ed6823e9fa5553b41fc8180256388085f581
font_02_sfnt_off00018b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B7E 10540 bytes
SHA-256: b9e591d30212d4703f7e2e41da620a80b612749031bb8348a29bd43d3c5ca9e0

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