Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc7b9221f5a919c…

MALICIOUS

PDF

100.0 KB Created: 2021-07-06 16:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d71f5d2dcc3cf57e0e3ccc82ec7f4ad0 SHA-1: e80b1e9efed0729e04660ee1852d51c716116623 SHA-256: ffc7b9221f5a919cfc64495e40ac883ac21585d18663316ea228f8328491572f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable domains. The presence of these links suggests the primary goal is to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://irlanc.ru/uplcv?utm_term=ffx+monster+arena+guide PDF link annotation
    • https://mmszke.hu/files/file/vozijuxufavikinider.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cac0fd900d5---36009484022.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dcec4288---korunarakujabon.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/71080459289.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/bubolek.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/sazazinuzaxaxewarawuri.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/0pc5mgtnobuft0558dg61coh13/45774153611.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db1c128e28b24cb0b1d4c36528ebf88c/62266066565.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/88525826287.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/fuzunovejupor.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d7f3ccfd7e705077a6974fa53140c2f4/soxekarodepogek.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7umemrdlnv1mn59p8ohte8pdff/rusabunemobeli.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fdfa942f2255da3a6302ddc804b02e30/fudumafegopefagi.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ef067c828447ed3175d365dadaf6cb42/96633243419.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/43592046341.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fa7893e50---puxaxezarudogekuno.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/10761387634.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607be316b8718---gopekurarejebixinujatofav.pdfIn PDF document text
    • http://kalikraft.com/images/file/89745038174.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aafeb6d48---jutot.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jh0ls9i05rsjoqna2vpp701tb5/19057281896.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774d62791e---73420642671.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073741ea23dc---kadifumamerepobidikuj.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5lm112pfl7jte7sb38c82klqdg/2749486762.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63edeff9c---58542309981.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c21578cb3---faravekubise.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_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 17416 bytes
SHA-256: 7500badb91029a0ee182f3aaa9d8b5abe280a0a859bd1e20a1524ac907138fef
font_02_sfnt_off000169f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F5 10828 bytes
SHA-256: 27aa8a25ba95c63c47bf3419ab3413d67b2cbdc8886ccf81892f4122b4f06b65