Malicious PDF — malware analysis report

Static analysis result for SHA-256 8821d0f084bf2587…

MALICIOUS

PDF

101.7 KB Created: 2021-07-27 21:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1417bf45b2e50b84b11f3902beeac3e SHA-1: d04f1440cc7a634ab45a944cbefd4f64f1bee560 SHA-256: 8821d0f084bf2587f3fe60e3d7b78e5a24b0ac310c54448e20888da426a5d0af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links and the use of compromised CMS uploads suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/db4e0f72eca33d38db9172a6fda71944/kepolom.pdf In PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/wugubefemuwamodefopiwikan.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/79994731764.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/gebejujom.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b9f50534---65438471333.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/62396742469.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6ca4557272e030185fd462ed5cf6969d/24212700785.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/80293599728.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/74792494127.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0jb1o5u9selgt3jo3rhn28ojq1/kepodoniwozitusejuzom.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e1b305f490508fb33fcd6b8e92343216/bumib.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/fg0m19m3b3sfm7odfsdpai0st7/lijupifadulipemupubodaz.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/lutadumokuxale.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/givudokiwapixowemamu.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/rekupemalazaj.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/mafobemevituva.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/304e68754d15332ec5d5b759377b0049/wulegijunolenakovuwol.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xikafem.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47370093481.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/03357e3b4a0de93ca8d7e6b36889464d/98065665917.pdfIn PDF document text
    • https://ebooksweb.net/files/file/63656805579.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ac52dce4f8bde393635ac4f2d1eba859/muxagexo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tpi39jaefle6qlmo3qup1aekb0/tivew.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fogakubokatuwefozekitaka.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8d9559d5a27e7c2db975cedf2fc8181a/libapobozokawonokejawogat.pdfIn PDF document text
    • http://93564497.com/userfiles/6197248563.pdfIn PDF document text
    • https://noventa.cz/media/files/file/564263744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+pair+xfinity+remote+with+onn+tvPDF 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_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 10768 bytes
SHA-256: 1bdf02447d645298d48220cf27130b07daf286661fd922c9611bf4500cea231c
font_01_sfnt_off00014247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14247 17356 bytes
SHA-256: 1da92d92f5509f7b78c521529dad6eafe70d70c92e3a3f21c60823e11dd5da72
font_02_sfnt_off00016f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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