Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ab1cd51319a591…

MALICIOUS

PDF

68.0 KB Created: 2021-09-07 02:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a50b0626c28671d88f5b3b159a78174e SHA-1: 3b9df81aa3f0fa35e1e34c2f39e1cd5042ebcfaf SHA-256: b8ab1cd51319a591bffd29ea6acdb4326691740b0ee2fa78005d3a46300fc50d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a screenshot to obscure clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=titration+curve+of+all+amino+acids+pdf PDF link annotation
    • https://digireg.cz/upload/piruluzifovone.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/69543954471.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/22356038243.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/515e58e42d4b0863ec269599ffd80ee3/95345030773.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/kolilepututi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/3704796290.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/b34o0pgtquh6jp6ec5i80jduef/ketaji.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7613d5ef60---babuzeb.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/40036028660.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/28571435623.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/44468078350.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/vabetike.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kudinas.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76007c9a7d---wodanamudinonokata.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/lulafanorujiga.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123de6af27ca---71379691267.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86e20918d---sixibug.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178564f73c---tinufotobotuneka.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/duxivozig.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zonupixababumefidixipe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/49fd4f6d8e7fb9932b3738ab93ac157d/kosixulirumoru.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/2456678439.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4ab1f0ba---juvumuzipe.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_off0000af52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF52 10908 bytes
SHA-256: 3e55e7433aeeee4af069642c3f9a621bf5c02a8d54e80bd4a92815808e8a631b
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 13912 bytes
SHA-256: 11ee801bc4781ad29f326fde00e48f72f4c1169266320e17ce1c467f2c472f86
font_02_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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