Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dd60aa8c85ff02…

MALICIOUS

PDF

76.4 KB Created: 2021-07-24 22:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 915c2c1e8b2487db5f89a0fd360fdc3c SHA-1: 2499e0a81acf0293ef346e12806efac5767ee272 SHA-256: 43dd60aa8c85ff0238d6a9dfaea5b7870bc938c6d60b48aa70e4b50e54afe80f
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a strategy for SEO manipulation or traffic distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nattasampun.com/upload/files/54766157450.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981b238---rejimojurukotazudinuw.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/waginopamowi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/38034747020.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c4053412---73834128613.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/wimugelawidul.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/71941662355.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/rojodumepulegatexanujel.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/694bb89f8ac19dfecc6e5c1bbfbdc91f/motunigepelozatoxepesato.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xitebati.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/65551601361.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xumemapufexaw.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/810a6b6c6a1f35ad9ff4303869ae5102/topezefu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54cdc6f86---lunoxobe.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/gurujipilepipejamuge.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92df677603---34661431035.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2249d4a5---zutasetujafasidorobofanob.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/lorer.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16091afa3aac57---sezulujasutezu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609252c4d8db9---sajevozitogekudizibe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39b45cbfdfe71fb64b659e8a0e340f7b/59361899758.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160acd867baa71---rojolijigazita.pdfIn PDF document text
    • http://jaatkinson.com/userimages/vinerepevobejorused.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mareez+e+ishq+hoon+main+song+mp3+free+downloadPDF 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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 11304 bytes
SHA-256: 759c1b52ff801cd5e9d682af7c4b3579cd0928c5be129beb22e2f6b41bd70f2c
font_01_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 17136 bytes
SHA-256: c941bb0a158d797f5a6ad75c76e91cbcd5e5a601eada7ccb85f1ddefd292a343
font_02_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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