Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb443523f6bb662…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 20:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eaff6009c3e0d64aea52ddb557039972 SHA-1: 216e7dc293c7ee06ab009d24cb9cee88a2046af5 SHA-256: 5bb443523f6bb662385df906cce41a94b8843ef1c5dcd254a4e5bcb553b19015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links strongly suggest an attempt to exploit users via a malicious attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/694a3bb88ea4b2be093f23cef8e66dec/12092554185.pdf In PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/75171922353.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7ce7c2vrqt2mtia6da98bdq8jk/xijitawuf.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/57771491d3bf3675615a4e00b5c281c9/56193454866.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/44347726532.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/furakojisabukuta.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/dizopumuxepabukipemedi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sij23o5b67iofkn8d3k42ttsbf/26956281338.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/27274866824.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081620fc25d7---kulijigomolizovuronugam.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/15a4efd46d6b9026c2778ed76919e33c/buvipogoj.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab1b5cd94---batetopudixulololax.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bc74ff73ac4180841e575ae453dace4c/potixojurijanotimamuje.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/roxikalugivefugewudas.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83e8335ca---89470805051.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e3ce268f48f0b044ad2b514b5c123ffb/wetuvijutedep.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/mebakazobofila.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8n8602p0iv1c6eikd6brg1cr49/gulumunejafubafa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae50ccdb6b---21606975832.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/61205103617.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608808aa431ac---mokufa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afee3f59541---minarobesupesul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=textbook+of+obstetrics+and+gynaecology+pdf+free+downloadPDF link annotation
    • 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 11292 bytes
SHA-256: 4df3367d4bbee97cc7a41169b92dc4af42884d733e46ebf54a498bace20b67d4
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 17368 bytes
SHA-256: 1fd712d038e379d22c979416b17d652ab8021fdc7950e08dde4a3bdaab84f1ce
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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