Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8f5b0178c7d348…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 06:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab60c59bf11d6975b882241697a39a4d SHA-1: 75949207a88f369051785bf2c281039c56ce0e0c SHA-256: ab8f5b0178c7d348040e535d43f89a595debfd1c96bd5e9900e84a68d60ae947
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating an intent to redirect users. The presence of multiple PDF-specific heuristics related to URI and link farm activity further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=erik+satie+gnossienne+no+4+pdf PDF link annotation
    • http://chixue.com/uploadfile/file/20210623123401.pdfIn PDF document text
    • https://hgb.se/filer/file/74757147802.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0234501001628885189.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abdaf649f6c---56627975044.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/vekedepijal.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/daxuve.pdfIn PDF document text
    • http://4rrecycle.com/files/file/71988784488.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c47d7ead4---dazigenulepovo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab24731452---xenowaza.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/koxikatumabarokowal.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/94168112292.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610b62320e0bc---23144171353.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6c6dedf27239de8ac9a3049551baa923/dinusulig.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16099366d052af---riripezugafapeli.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/luzigakevomutodo.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/turijosimofo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/711d245f61ebcef09da8093f8b868744/kubegutetufunodoreme.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/36552437494.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160964c0b14712---dusit.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1e360d2d67ffd220b09b2395b062f30e/walotaba.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/89365359155.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/fepofutusadilaxugobakujof.pdfIn PDF document text
    • http://moristas.com/userfiles/files/364363185.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/bepefesikiwexuja.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/93006127a81dfba733f731f469cecc6b/mokerewev.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/xakenijam.pdfIn PDF document text
    • 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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 19732 bytes
SHA-256: d9e4bc4e8b6e9b9f5d19e992ff0d97fd2aba3b92801db0a5781633a220e27924
font_02_sfnt_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 10780 bytes
SHA-256: 70f970c99cdd27caea454198b9305d93f5cf6cd979ee2a6d78d0bb6d92f62a42

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