Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb5a106fff83af1…

MALICIOUS

PDF

104.3 KB Created: 2021-07-13 23:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc745e521cd5e92204cf3be5be5effee SHA-1: 201073a387ea1a7aabef3eecf0f997ad6a2b478f SHA-256: 2bb5a106fff83af1146fe98bc278d52edc138948c5530ec873393f49042f5433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://mfahk.com/upload/files/bigoto.pdf In PDF document text
    • http://elm3rad.com/file/72475279248.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7183194c2092c97491e191f1c1c7d429/tebajawumigesagigejuna.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/829449eb67451fd75951465630a85104/72418325446.pdfIn PDF document text
    • http://renovator.cz/files/file/jipab.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc745bbda9---20448125972.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/85044457122.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/bd9f0a266a37d1f2fb3b18d5f5cc5fc7/16358723921.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f8b45eda---polisudijodulawosisalik.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7436082f0dec3d78db2151a7c4f46635/jawovebejosoniweverifoz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bfd80a37e---xuzaviparejod.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/81205087439.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e0519b4e92d46fff829cc825a40e5c85/lakiful.pdfIn PDF document text
    • https://dm288.com/slicice/file/58901498190.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26782e07b---gevedefetunugepupunusufiz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160743527d5627---febogavotarawenuraxe.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17b47b72e---24307613601.pdfIn PDF document text
    • http://www.emailposte.com/pictures/2333709697.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/26b84104a1082ecefd80181d60eb5065/bubuximewowowunopopepar.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021051716212865285.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/90553476460.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/42811615920.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/851d276ba1741a5066a63abfa6fba3f3/lurifopozibedenuvatul.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7b751e74---68663350102.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/37837011647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=my+cat+is+meowing+non+stopPDF 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_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 10764 bytes
SHA-256: 90b3f65bc021560eb0cc4eabcf56e5200f6cd1cd6d6f8ca63f2d876aedf31e71
font_01_sfnt_off00014cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF9 18268 bytes
SHA-256: 77ba39f75ea867441b57f1d1c59be039c5f8118d8bb218cf196b662496c28ed0
font_02_sfnt_off00017bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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