Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f86ccb68b67bcb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 11:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18ccd27917639939dfa6943f82b5db32 SHA-1: 1a3c387c2532ee4e8a206918246d99182bf1caf7 SHA-256: f0f86ccb68b67bcbf803d3ee0766f2acaced1698af5e62fb5cfcbf2e8b67f37f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=candy+crush+hacker+apk PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kozojozuvoverakunereje.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143778157f4f---wadojadesozi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614527e363ff3---80375926422.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/pawupodanalejuzoxab.pdfIn PDF document text
    • https://btegypt.com/file/bemeputovifakaduzokizo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fatubaw.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/govibijiporo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vuzebamadiximumalunofaboz.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/finuzokanepukesifo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614466c634764---48530057167.pdfIn PDF document text
    • http://kag.fr/userfiles/file/92116570279.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906024804.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/35654054086.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nokovebi.pdfIn PDF document text
    • http://trivio.it/userfiles/files/bamazeziseruxagolofak.pdfIn PDF document text
    • https://menu2uplus.com/images/file/bapebelagazolalotixivixif.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bowekomugikuja.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/lugazip.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210903232153.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/77482776810.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/wudizefapap.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xonawutezikexowododizape.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/16997079905.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/luledebuwivez.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/16732439835.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_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 19380 bytes
SHA-256: 487a259f966aaff93ef2044aaf720b970c50deca4891f553216f871e6c23391b
font_01_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 10592 bytes
SHA-256: 22f9664bc4646954d6ddf9e3e363214404caecb113e0467a52d090b2b58d87a0

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