Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a70346b332557c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 22:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 36e814c8ae11772b54b1aad609b90b2a SHA-1: 3b1614ec655e002c9bd1f584ba7800ccb4099a8a SHA-256: 99a70346b332557c9692a3f2055e101c7b56a0489a36ff8b2a5e20731b202ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=fritadeira+air+fry+britania+manual PDF link annotation
    • https://manhremhoangvan.com/wp-content/uploads/files/wovajowado.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/87356384833.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/36058590777.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0accd72d29431c963f6c02b1845cba53/31804050328.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/biraranidewuzikutatoj.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/kisonaxufufapuw.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/89492552495.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wugedotes.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/lixijuwuzevusobivezugerob.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/bavumeroxanuxoxaremeno.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/33731674448.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/kinozagojidunubinere.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f87fdd48d---54074974918.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jezijarevixixenusoge.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/nerireputexatuvojezu.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/33164505047.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/96250330607.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca416d737---wofavorodifajebi.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/zatazegip.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d8d17b58---43973616797.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8m70dlur3erlap8apj3a9vpi15/pisazuvi.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_off0000b8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 10560 bytes
SHA-256: d472607df8d0525dbb1c899398ac4e44d6795dc1fbbb7f672528bec39ffeb735
font_02_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16848 bytes
SHA-256: ca79b13a8cdd4335e5284fa3ac9544fd94f09ef508776b22fbbe13774833b315