Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e23c1487f377998…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c6b3ab7a2a194997da8efcaab6e2b8f5 SHA-1: 5b3aaa11cbb414f2bbdc5f33b9ff4e2a4c7c5413 SHA-256: 2e23c1487f377998a4509b9608b8c49cb1d4f017a02ce032f526facf5a477902
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8d3f88292a7d7199f2e832f87c58550b/49975116826.pdf In PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/17659915322.pdfIn PDF document text
    • https://ip-pharma.net/data/files/93462328075.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f33265144b18fa06901749a25acabd2/43589936339.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/94797129340.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/46101775797.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614356a1a361c---87604225249.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/74960454875.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/wowodaku.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/rimuku.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/valem.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/sf89cujlo49fqur243rug5cej1/40309781887.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/16912143618.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/75995568454.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/96491524289.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614129c814c05---pagozoge.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161461ec9da435---tarutatulemunoxuneke.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/6529025340.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/woketevibusimuvazem.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/4965273529.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/rugeto.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/71583986159.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/peximiwepo.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/58099457660.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/83708223506.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/mupakowutim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+free+likes+on+instagram+postPDF 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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 10872 bytes
SHA-256: a1c900b5fd94e86a8faa5c03e04522dc9ebd63f76bb74f54921284d697a8e0cf
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 17268 bytes
SHA-256: 78b293e8651731140e0679b58364c1fc31b36082cf2cf524a63bc2dde7f18372

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