Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eef1b953a5b82e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-11 15:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 751650a24b16d7cae7d5bca52bbdb4e5 SHA-1: 060fcf178b6ba2547013c21ed92134674c3a85db SHA-256: 27eef1b953a5b82ea8e4334f35df43c39906a3cc80668faa8df9cd9557fd723d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous external links and the high risk score strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mudrberanova.cz/userfiles/file/82602785691.pdf In PDF document text
    • http://bsinteriordesigner.com/userfiles/files/62235063609.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/fabazopajuwokifuruvo.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/86072788603.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wexejakije.pdfIn PDF document text
    • http://lg-palette.com/upload/files/91926197222.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/srgbb923pgc2tspb8nebv062tt/sewobunalewitomeze.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/4745127072.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nimosik.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/25053413191.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161319c8588508---fizof.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/14651902790.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/rimaxefima.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kci8r29q52c02ib7va9nmlbrrr/naninibuduji.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/kexipema.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf3855d5f---7805702861.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/zenalusikadimobof.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/28599113769.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1670219056612fb00657488.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/tetelojedivevi.pdfIn PDF document text
    • http://iphysiology.ru/upload/xusupaxijexe.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d20071e994f975472d447f6883b7203/duzosanororujoragebuzi.pdfIn PDF document text
    • http://builderall.info/userfiles/file/73905638228.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/64428300190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redmi+11+lite+5g+launch+date+in+indiaPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 10760 bytes
SHA-256: 88fa0796e80a70add31e992cead02462153b9f56c3c08ffd9d1a5b3c166c5bb1
font_01_sfnt_off0000ca80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 14860 bytes
SHA-256: e28ad2d6d94596d4a3d9257430fae1ef16ccfdf1ee987032a6c7d175edf539e1