Malicious PDF — malware analysis report

Static analysis result for SHA-256 1533454b27f10f0f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-22 22:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 06b123c5f4b59c49aa3e3c6996f4b908 SHA-1: 236b1edd486db13e93218140e3067560f8921fb1 SHA-256: 1533454b27f10f0fc8a9e3aeed9ab2d5c6fd9ec0ac8ad94b9533b13a8b6b2902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://denge.aero/upload/files/kiwemolivujijatas.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vosds5f9qp0j72pi3onrbo1ee2/duwivavadofatapatovop.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zigaxufodokejozebevun.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/8016502977.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb0155853---12132878371.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210604163455.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopajinorapozesu.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/29201897247.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjqg84skk9cgbbqqbv6t0grk14/56155705262.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/j7eq0mq0hfv0u93cpd2233rk1f/pavanalasilesit.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kititodowulovozik.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/j53qhg22r26vh8jjv6q9fk0obe/48514368264.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/wezisibozidijazisiwutax.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/47675246533.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/2589274359.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc9dd66b---24336845476.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/10301263133.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/23256535769.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cscmmsh60djjat35ig45smh4ff/vofuremafumibenuni.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedbd73743a---sagopemabufusodarizimi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab058693721---vegiwixatisikaxunefixes.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a930e8305---jejajoja.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/novajinidebozafalulir.pdfIn PDF document text
    • https://ghnservizi.com/file/buzirejega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=structural+design+of+two+storey+residential+pdfPDF 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_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 16412 bytes
SHA-256: 1e8e95e33a5325578d3dea0f1deefd30fa7b288b9e509444a0c2b5a88534a4ba
font_01_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 11172 bytes
SHA-256: 35bdd098ce3afa13717d99809b24f6505ad2e1af2f9c62d75e769db4367c23ab