Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c3539ea5cc6b2b…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b5e362ef6ca1d073d3449da7e0f7a68 SHA-1: 9aae8a6f2a218e7a763a5fa6ec567ad8a0738f93 SHA-256: 64c3539ea5cc6b2b58a26173251b1e58129aa7b96655f23ef64b9f97d2df0a82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=pdf+to+excel+with+ocr PDF link annotation
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/46892247488.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0e67f1b35505700b53e15f12a1a0721/pagukolojekimilaribudapab.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083610ab0176---jewulodilarinoj.pdfIn PDF document text
    • http://ruresept.ru/files/file/fapajaboniten.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/49866002733.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/67393034789.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6k25hp032sac4krhmsi8rbqbgi/benelumedumisiliga.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/pesaxat.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/68593335120.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b29c3e375---wigemo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zexesekegaduvu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/23527801324.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bcdbce198d276f6db53b3fbaf91f6a3/fenite.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/kawiw.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/85206341200.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/47257457657.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/fosatozixunaler.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/41606085821.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a857ae841---81041189459.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c60ae314d---kamukaribifewagoju.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/89775c6e78a296a2546ea79bf302c133/19164206096.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/sewexolirekobe.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kaziworalosilajisoju.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/eef7dbf14ad9e6f0639be59ebbbeaed9/leretasiwop.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10328 bytes
SHA-256: 8ea753fdfe2c48759d661b9c163857e69281f3bae07273b245290af94f64ccd9
font_02_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16824 bytes
SHA-256: 6e0212ce82eeacc8cae9b15f486b03d07a699b34a2f1ae23360336970c602b34

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