Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc30c5450338c08…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 18:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e58d2a140a9301209bb1f98f73788aa6 SHA-1: dbb6f3cce700379803fa06d0858531b096e88a21 SHA-256: bdc30c5450338c085a092e90e24f82473d86df827e76ce3c2240a6cfd77113cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to PDF files hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://xn--b1agpbmdtf.xn--p1ai/upload/file/mimoxowadorum.pdf In PDF document text
    • http://hanifeugur.com/image/files/setelapibemenanepif.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/bapikexidupula.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210910203536017654ljo7nt.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/noxirajelatu.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/kiduxa.pdfIn PDF document text
    • http://cssh.es/img/file/43316261096.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/rulodutosa.pdfIn PDF document text
    • https://path.mn/userfiles/files/37456679647.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1261cc147---kubureruzaputaj.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72887829193.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/32289795092.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/69388139790.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/12366942108.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/51951485007.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/wuvefakadi.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/347167661.pdfIn PDF document text
    • https://simorgh.it/uploads/file/jexudometejutuputapeg.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/luxokebopuzone.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/4362001456.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613843b7d470b---mukezevujo.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/voratumusitobaxusox.pdfIn PDF document text
    • https://inarsindbari.org/uploads/wobenat.pdfIn PDF document text
    • https://palet-school.com/files/files/3212658468.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/jowujalepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+import+contacts+from+android+to+androidPDF 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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 10680 bytes
SHA-256: d448be643c6ade554c91354d34a981a1b5375a1854f6cd1cfc349415da9237e7
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 19724 bytes
SHA-256: f055440145664060a7f1bd56e70b5da25fd6f413887fde8d0a29eeca472b70b6