Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e5848b6a7aa843…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 04:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c815d22b7aef9134da83a04e638ccef0 SHA-1: 6a96e1c0f42c79c14762831828c2bdaa5ce41b17 SHA-256: 78e5848b6a7aa843e65f5f45bdbd6a3f8e6a955e042198615130c8e5271c8f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to lure users to malicious sites. The presence of ClamAV detection and ML classification as malicious reinforces this assessment. While no scripts were explicitly extracted, the nature of the links and the PDF structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=carburetor+parts+and+function+pdf PDF link annotation
    • http://cck-brno.cz/ckfinder/userfiles/files/8697853100.pdfIn PDF document text
    • http://livestocktool.com/d/files/mutabovozebutibonuvofusid.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/d3ljlm2ovu43lgkda7hjf6ppto/47090619167.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/54087426296.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/89637780934.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6sh36p9r9ldik8p850f7qcotsk/1945438147.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8276a6d44---mexavarizavenimojusujuxu.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pokizelejo.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zogigatimifapixepalazope.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7858b46c859c7c2d036dbdcba2e102fa/69845122923.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/novumenexovaxajenetunix.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c4a523ab---83328114067.pdfIn PDF document text
    • https://masukpt1.com/contents//files/pumevi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7de39d66---dunaxomebomarelejenola.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pakegate.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f5af4141657514db057ccfebf62ad0e2/14642121945.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/2babfee5ffbc8d3ffd43496ccb9e738c/kurove.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/migutebifos.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e654cb06---90544484288.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qtv2bt6gfg2bk8kmqtuilfo1i5/xonovomagafodijap.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sofulobuw.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/fobekizejerumilenixejara.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/kobuvid.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/figonulusesawodid.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/80324093944.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_off0000bdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 10836 bytes
SHA-256: efc9617b0d1c40d13a0d6bea40f28ace5e7b95f0538750468d035a913c498329
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 16040 bytes
SHA-256: 0642db4be02b487cb6bf310b2b4001bbec073f6fc4fa12043ac86374634ebc32
font_02_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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