Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa9ab4f1962088d…

MALICIOUS

PDF

73.3 KB Created: 2021-07-25 04:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6ee636e7c938f3a5a60c6bac6854787 SHA-1: 343d5f13fefdf8c278cacdfae9906eb2747843db SHA-256: cfa9ab4f1962088d4d7d325c7b11506079d900db514b76779960a1ef757f64c5
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary goal is to redirect users to potentially harmful external sites.

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 https://fertilizerproductionprocess.com/d/files/sepudimaruzanawakeruw.pdf In PDF document text
    • http://wsp.pl/userfiles/file/namolupajatite.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160852c305921a---81672623904.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/804c9544529f56bfbcae5be2f799af7c/fapanezitonagakaxifojavo.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/levekibu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/00cd1f353b910b7ec0c8009668604b51/muxunojinixerakegodajabi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/m3ed8n2ig440j7qnvoj30n68ro/88693319546.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740445287f---40742830846.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/91537263979.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/rovixeredisuk.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d550af35b---98266558148.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c79e4d2c---63826807344.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/41422874368.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/29948863800.pdfIn PDF document text
    • https://peterdegendt.be/file/93474212954.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/875d0eb50826eef9217d5d8f9950cf94/42511095486.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832778219de---96232064946.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/vofisegifepo.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/bivurajamojufosevev.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/velosixanepuwimo.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/30420905324.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kqobq3395as4j2g1ji7gkac16j/rusogijabadogumenaper.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/kaxakufurinisasobabi.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c2447e5f721f4051c3ec7b49fa1b8584/xidisebuxulixoworafaparot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2b471db5---vojogodabanude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+set+your+dish+network+remote+to+your+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_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 15216 bytes
SHA-256: 3a79b98d9423efa0b7cec57570988b067af3746e52e34dc2e0b9fa36b54ec407
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10756 bytes
SHA-256: 75c3a0d5da82f9e432c6f66b2331c7dd9e622e1a448d0c153dbea467b365ecf4