Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b10e6a976cedac1…

MALICIOUS

PDF

82.6 KB Created: 2021-07-02 03:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 536eb326babc610ac54cd339c75a9e9b SHA-1: eb8c341bb2ca3136509f0ec7af04a297354abd48 SHA-256: 5b10e6a976cedac1efd2ee17f24af20371c31526b4818284b2d104ff14145a76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the heuristic firings suggest a phishing or redirection attack, likely intended to lead users to malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bkavs45fu0842kbe1j2bkfb4jp/vurawikewiwejaf.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/luzudonatinupokiko.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1133b788---9007429260.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/wuzuwuzorupav.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/82492178372.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fnphsog8864niapvotdltqeq1h/17706496117.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/tolegiguke.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ahrs53lek479qcr8vcg6urlq1n/lolaxifinapewibixowubu.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/bazezut.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/69684b96405d618720bcb5ba2294c9a5/tuxerabaxekafoluvanizux.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9484b6a8---61528765523.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/aa5150caa9da49fd7bc341e795e5baf7/xivopotobulabini.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/98441744764.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd4834981---26324112146.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/nelojumovagixasofejaj.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/35365513825.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/59813447832.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49517f2aa---biduta.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0476d3422---nulukidubipivamo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6983b29fa5---51002931964.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ecd11637ef2d6a74d48daece0a2f468d/lobivikavorozevijuw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b35dc8451---tijinupitatug.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/26dd96c40b9aa01b2cafe78f6d072cc4/4060756417.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b38653d1d---97192543820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=finding+volumes+of+solids+of+revolutionPDF 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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10676 bytes
SHA-256: 4cfb914ce47f821baadf51efff3eb9a91f3d520f2587975c70c8205d74f6ab09
font_02_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 18192 bytes
SHA-256: 639d6b2bc765a339a337bc915274af7651214806f39cebe332942d8d621e40ee

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