Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e593a3332a887c4…

MALICIOUS

PDF

111.6 KB Created: 2021-09-01 01:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e677c56d05d5d5e01520d7f994389804 SHA-1: 70c29f1f3bca0c88defbe1a8e83bd6d4d349c9a1 SHA-256: 4e593a3332a887c41702d1cbe798ad15777a47ebba97ba7884c21492498d785e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised or disposable hosting domains, indicative of a link farm designed to host phishing pages or malware. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to download further payloads or redirect to malicious sites.

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://ms01bet.net/contents/files/gurawulitepoduxevebu.pdf In PDF document text
    • http://tuanayapim.com/rsm/files/82316355049.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59141610417.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0111deb5b9---99539497692.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27671683940.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/94921a2e5996a68c93d12982e4fff85a/domotol.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/28970231221.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/ponanematazit.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zisuj.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16129bfef21a80---77155293869.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b5cbcbfe4dee78451e6a7438b6417b80/4465606191.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/ed9feb9d2001d384bf884ef53742958f/tefofidulufakokenero.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160810e3316c00---72712885966.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/92bceb6474e380d728d9e57083473461/89155736094.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ba7722e3f1d37dfe11ed8b058f8b22f5/64665675660.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/donanefeniwovosonotaw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826fb96e49a---85610174994.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/54316409739.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/tafanara.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kogowokidamer.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/77808523661.pdfIn PDF document text
    • https://dellrein.ru/content/file/faxukexebafugatadararale.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/88927900.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/833bc14a3d8c317d7c5fc2086fd1688d/lawajumojoporenagupemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=thats+hot+word+whizzlePDF 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_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000168f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F1 18004 bytes
SHA-256: acc1a4902aec10ed76080076b1dbc4637e1d478efa1120abf503142b4e6ecf48
font_02_sfnt_off0001972c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1972C 10348 bytes
SHA-256: 163a55aeb18b5e97fa142a7c79274250553281f7c0bfbe96eb900c92ca5db93f

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