Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5079f0d790b5f4…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 14:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc216923b23d45343bdc68217220b76b SHA-1: cb347d532d2ab8c06c54f98ff148ef5d4e6375bc SHA-256: cd5079f0d790b5f4835cfecdc358e9ff9a3dbcd74105c03823d7165485f39f16
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a malicious intent to lure users into clicking potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://prawobrzeze.info/userfiles/file/99513469915.pdf In PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e0f4fd3131566a8e96dedcb271f71a4c/42498717448.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/94571215295.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/galinufesoliwudafelejudo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98e8c5ab0---63476096805.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/lofositofulukibupi.pdfIn PDF document text
    • http://bjjiffy.com/upload/14801273409.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d00d074db67---40436499587.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67ae77827---lezipi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9gkq75b6i3srugivni4kjj5vm2/panipukogidudepifisepib.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f64d8c495---46196105081.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8qahi2mei2dhk4v7oh4rmtcft3/lidovuzukoluxowuxuj.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/babarumovibino.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b686945fe2---xofabetejudifosotew.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/ximarekawunazirisanav.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nnko0kklvhnl9iu3lclfl14g40/67105864639.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/94386577892.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/59409564773.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lsl2m5novemg1k9ni1nohnhooa/kefewawekedebixixoz.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b7f0gmnifo2s6ftbf47njviekd/37563925863.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc0d04696---jogixoviwereladagugi.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/70383262238.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/98339939051.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16090780ce322e---15433699551.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7fb0e3272146e47ec3fb3b1359fde249/tejagusux.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/27958823490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=do+harm+toPDF 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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 17900 bytes
SHA-256: 32410ba665da9c3c5e025b5835428c572111257b774a80b4eaa191aec204bb32
font_01_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 9832 bytes
SHA-256: 53ff97fb7fd1a439d8cace0b512fb11c2db2b46b811b7035d9029efd089265d4
font_02_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1