Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c62290c1cc5998…

MALICIOUS

PDF

90.9 KB Created: 2021-08-18 17:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 50e68361981bfc5aa97a0ea815c0c8ec SHA-1: 8220e115a498a1bd456018c1187dd5794fc2374c SHA-256: b3c62290c1cc5998ef44695904597e4a23476bb7b40a9d374eb4a188c32fc5a8
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c958dc3a9de---38648349891.pdf In PDF document text
    • https://travelworld.ro/userfiles/file/wekina.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2e753f97---pemej.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/120e27494fdefc8a77a67ac86b317e3e/fadonotaporowu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ej8ko5dmpsto2v9pad0f9l1tbt/xinobelu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf0dc2f9b---bewuwexijagip.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/95403427568.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c8cd98d5f67354e908eff1d4452c2de0/fegisamegokomitebugewifi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2b1c9eae---88433683751.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/foziminuwavov.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210531132641829.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/56360699449.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zajonetalabaladubiteg.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/43345325304.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jd5i7mrbnbqp11meunp79r57p/mexapivewozimofadip.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/taviboleziridisiwogi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f849b1380e---xesizamonojex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f76017d5---90130775401.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/57937347652.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/netasegavakisonalovifabi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0abca99d---92493760130.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fevoxosaweziju.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/reparuriga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=andrew+wommack+net+worth+2019PDF 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_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 17728 bytes
SHA-256: 2ed9c2aca9e9875bf082c20f1f81cd998d6d1a9e6fa6a104a9c776a8941b6f05
font_01_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 10948 bytes
SHA-256: f33c9c44d3167200f64cf656e03b06d33679bd0daa56ba2bf5d212893677803a
font_02_sfnt_off0001457d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1