Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fc120e83d597e2…

MALICIOUS

PDF

83.7 KB Created: 2021-07-21 22:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11cb3d7e821eaf2ae2072ffaa74ff8c8 SHA-1: 2120c63b7fa38b4984c8b78fe3bc77cea64cc53a SHA-256: 33fc120e83d597e2e0f9261e441e2fcc7323ad0cf63654c632175f9e750a894e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c7c9cdd16adb0a5fc568f9c1b79240c8/foworikove.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79371813f---37084626531.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75833c62f---befolebamuwifapodovezota.pdfIn PDF document text
    • https://ancoraeducacion.com/images/78014966538.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/29751003118.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/ditevakaf.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08fd0c87d---18661951981.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fdee431985480129aec5b9e92429b03b/61914663108.pdfIn PDF document text
    • http://billsky.ee/files/file/55274367223.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/52286963896.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d62b9023---75286087173.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fff2ddcf8---rugozesulajadijoxofanogis.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c40ee9592c8---tomininufatomameterixolar.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/bupop.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f543b3697a44b4887e0acfdd52bac214/85680617120.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/muwivuxejinut.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nozegonotes.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pizoto.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/kovejubopad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=beautiful+tamil+quotes+about+lifePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nejawogologotewadasawene.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_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 10608 bytes
SHA-256: e3025094b209e6b4bb3616de6d2cf13f7d47bdfb2d38b794332912c7778b87f5
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 18148 bytes
SHA-256: 7317fd47c525dcc8a9a43bf8924f6370cc2fd764abf1aa6ef1ebcd7d1a03425d
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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