Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a451c7c98c00f4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 11:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cc8bd1f0878636e5b3024fcbecb6961 SHA-1: e28d6a31b9350629a36b3c91d9ce6fdf6905bc85 SHA-256: 27a451c7c98c00f467b7ae81ade07af152d933e9e5d05984e652e65ace34d70b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous links to disposable hosting and compromised CMS uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it may attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=essential+surgical+practice+cuschieri+pdf PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39fdccf9a---kixozukadazox.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wifidenaxilub.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/45452180149.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/posobodajiwebakufileresox.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc81bbf0aa---sagolusalezixo.pdfIn PDF document text
    • http://goldmustang.com/files/files/87043113087.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d4300f2950b618e6e6a55d74c6695c6/19688839021.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eib0krjvdl90nhs06gril1og4c/89046787580.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f7242cf339e7fa30bd50f17e997b69dc/zefigiviwuweda.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609425d585caf---zukegok.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086175ddcd41---42130526108.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9rorp33j51d971h9277ju6vbnb/gipibikusikadojil.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/jutidubibetavunewom.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/82304119276.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612468d7720f6---86190156226.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f21ee05960a---dazow.pdfIn PDF document text
    • http://erdbau-rauch.at/2294516982.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/vopovasegizegawit.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/lotusatikugeseduzegu.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/narufetoterudizozasa.pdfIn PDF document text
    • http://iccarrentals.com/files/file/letidemafenusilorol.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/salumesonizevenupifamudo.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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 10864 bytes
SHA-256: 6a6fb27cffe6f9a6b6127981d11701f6fc611530dc0c01bfdd0874aed8f21a3b
font_01_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 17480 bytes
SHA-256: 882f2e72b0d0a5668df1c70347afc847cee418a69f81a304b288003ace0e3ccb
font_02_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.