Malicious PDF — malware analysis report

Static analysis result for SHA-256 b015786f04dd8a55…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 10:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 215f1774e0f62dcd82b72735bdd46931 SHA-1: 3fc8f1cbc6cf0cc8a9a25068a31e79f355cc1675 SHA-256: b015786f04dd8a55611c9c96a548c7d14f1e5c7b4d4083565e69312ec05c8df5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://markaoyun.com/calisma2/files/uploads/jixojisosokibigajipa.pdf In PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/razovetifi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zolutinirokuse.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b393d0d---fularila.pdfIn PDF document text
    • http://taxfreepoint.com/file/65629086269.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/givotazomulotaniw.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/xusawusogivigumepudej.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/misovopetavinapo.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/27855659355.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0286d706f682256d5fee092bb5d975cf/wugesiwi.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/31107506461.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/mugimil.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/1059694914.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/87991877968.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613901dbeaba5---36195031134.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12395710415.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fcfe86498b2359f60e1b0d93482b940b/26705151628.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba3f99a21---90294573131.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/58886597384.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210916_9744A38B6227CF80.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/5509793020.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/zigirozosovivuwikozu.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/49734409082.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/29526562989.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4527487255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wallpaper+for+cell+phones+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_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 17448 bytes
SHA-256: d4baf9c4ffae8b12005efcd0a23848020ac7f29efc887a503e152548957e3624
font_02_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 10608 bytes
SHA-256: fb0a69cf9ba5bf6a349fb8ffa5880a923a57eb4a382dad5f7383d7e918cb7aa6