Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab4ea51d6e76e1c…

MALICIOUS

PDF

99.5 KB Created: 2021-07-20 08:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fab189b4c2a7923116d02ba9f14c23d2 SHA-1: b562158c7861af8ae62b985833e16ff42347255e SHA-256: 5ab4ea51d6e76e1cc8db6e0d570fe59e17427c0f3dd9aa28df51f2436b2b03aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using numerous disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tt9pvqj6ljtfb30homljtkve26/59497960973.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716e7a2cdb3---50099816515.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7f9b4777918a9790dad947d11db2d15/65803932856.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/togofazupejatemik.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3007e7d85a---fumegakirugazenipozufi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/zolikozuzaxesoxasepapar.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080328858710---39331278450.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b63554a4a7d---nifenapadesasezenufojage.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tuweg.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78869abe1d---dasutikiliguvixug.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/tanaz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d262fa8f50---sikumesurexe.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/37584372403.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/85876868819.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf2e2b422---22801581972.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210630075801.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/uu1drc6bqp480q147co10aaqjv/62994574700.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a229e9a5cc---rusufadixasuwez.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/67181539265.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/283c44ae5dbba08104c08ed1edcd125f/54469032364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=after+effects+of+svt+episodePDF 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_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 10348 bytes
SHA-256: 006757cf527fbcaa22a6108dc069713120205af121b145cc53d87069279bfa7f
font_01_sfnt_off00013c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C62 17124 bytes
SHA-256: 02f7a7570e8ab27cb12c3932aa0a95221a6b8df985a35f7863cde0014b9682c0
font_02_sfnt_off00016908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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