Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b429b33d54df4b…

MALICIOUS

PDF

82.0 KB Created: 2021-10-16 13:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5837b256f91ac035fa5f39b0df2ccf4 SHA-1: c331e9938eaaef009baecd9ee679a4af5fd72c52 SHA-256: 25b429b33d54df4b5ec284af9bfbdece3815910d7f213403ad1db02aeedda391
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dehayemek.net/upload/ckfinder/files/21533293379.pdf In PDF document text
    • https://trompis-tondschungel.de/userfiles/file/jujefivoperekom.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/wufubup.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/96272086685.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/pawikek.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/jawuwo.pdfIn PDF document text
    • http://hflchw.com/upload/file/91182794994.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b2e5b84353ed5beaf0935e8a0fa79e5e/39735855526.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/83051785423.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/fivupowim.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161649a42c1ff1---21323393600.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/wibadegepepoloka.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/93981139955.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b2bf4d61f9a47ef258f6860b35c58822/kaxojalod.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/8397041256.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/xulawanofux.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/zivedu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bd75570b---fejemobeluvawodiw.pdfIn PDF document text
    • http://hainfelderteich.at/tuzabibanozetu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5a96b0f0---16883272990.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/78198917535.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/98259326810.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/40464307871.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/tetanusudisas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=lead+ii+nitrate+and+potassium+bromide+net+ionic+equationPDF 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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 10972 bytes
SHA-256: baf679d0454fe68c81d80563c66fd906b62cb451de63cec02b0a3d1148401f85
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 18984 bytes
SHA-256: 49fb59f34ed8508eca09c8ea1bf618684fecb3e33cda36e3355684f1176e3f16