Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c114de8494fa92…

MALICIOUS

PDF

82.1 KB Created: 2021-08-04 14:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c49935a09f341c7760e4fe8a1cc30d7b SHA-1: cf45e92c65098954d4370463e219e77e3241d9c3 SHA-256: 43c114de8494fa92dcc35674e759e90f04d75c701b266986b4aa2dbbcb79ead9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=tabla+de+dobleces+y+traslapes+de+varillas+pdf PDF link annotation
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0a05ca61fa88bad06fb610a3f3e91adf/91081721701.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100203484406---89986305463.pdfIn PDF document text
    • http://regmac.net/userfiles/files/rapipofakitidakuk.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd096682bc5e0dea9efc0ab68c8e6bbe/10592076288.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/69108810829.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b54712096---8099767363.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dbb7c79b1a13f31a36cef8741657284/famawewesaxaxexunerisugi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/54264835168.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090da48b70ab---86672683659.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/34848811754.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/90i4o4rdbpi4bivfn1hlk0g9ve/ziminisenese.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d770d295e5---nemubajejevinogopowamemu.pdfIn PDF document text
    • http://metallpress.ru/files/zogebikorabux.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/21038257998.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/78db8bd95e85054ea6ce5e6f193c434e/48780720299.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4453736b---sumalotubemerafijajog.pdfIn PDF document text
    • https://digireg.cn/upload/nowuxabilezevigusobelij.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210610054650_kj5agl.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/tuwapagafusumi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/d1a936384ea00c37aca621d2e253e8f4/57768969851.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8p7o67l73n9v0qglkvvm83sj33/22592456580.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768582b0102---62546203992.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/41808450988.pdfIn PDF document text
    • 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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 10792 bytes
SHA-256: 1c67f224b1a4aeb9420cb5548d95464986e5a72184a2988930e46114ceac69d5
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 17384 bytes
SHA-256: 09e48835c3a0441cd15bde9da6cbefcfdeddac137ebdadbda1d7bc18245fcf87
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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