Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b038f5864c6a938…

MALICIOUS

PDF

93.0 KB Created: 2021-08-11 19:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d0c027203a2d451e9a96e5466a1a1be SHA-1: 168297ff72e891a5303e954369fbb17edb04799d SHA-256: 2b038f5864c6a9383a8e18fdf6521193ebd4ef6bcc6b45c4c71f04786934c42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://mattress-leader.com/media/nuponasoxinabufu.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfa79059e6---xozobeligazi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddfb739e7---nimamerese.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/kolopolorija.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/16077766902.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872de991e88---23171230086.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9932e99bb74477e13e38748d0e73e05e/31890864876.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/20e89115bce19f62bc9f3c15ee742068/84596779314.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac7e36b02---68196475237.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/1098266365.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/fvhnujc9k2ps30rfl3ha38l2iq/25984218637.pdfIn PDF document text
    • http://metapolar.hu/tmp/rinoxiwepimipabonizikoju.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/17119108973.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/59d8qeqcgslm2jufkb2kjttmnn/34895187179.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e2713b82---12411559288.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/sozizetobo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gapafurizilebijabokobaku.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa8536f59---62811257723.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b3d07be58e4a279d9266e11bfda329be/kosizes.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/33386277420.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4e582d3d5de4896ff27511eb0c493033/33310771298.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5c0069e3a471968dbb45d24294291c1f/64387712145.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/soucdk69k23sa3k5inf80fkdml/dabixubo.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/pirimugus.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/61b5e45049a2a87860b8e917af7942f3/31813791537.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3f2705285---rawote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+should+your+hcg+levels+be+at+5+weeks+4+daysPDF 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_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 17940 bytes
SHA-256: 1a8d5a34b1d8d135ed0172ec6ac622926acbd8daabfd2dd1a87b6eea6083e32d
font_01_sfnt_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 11256 bytes
SHA-256: 7bdf4f37a3ef00fee5cb3056b71c252af522fb937dc1bb66e6111a82890a26e8