Malicious PDF — malware analysis report

Static analysis result for SHA-256 8838dead1cc8d27c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 20:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57da8013c65757c39af0f09842110850 SHA-1: a281d78fedbcb32753cf2dd8eb7a5a77233071e8 SHA-256: 8838dead1cc8d27c774b3ab6a48f07c5a8bcc06d9db0154aac00c6f874fc2ea6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hoya-system.com/uploads/files/202109100551117038.pdf In PDF document text
    • https://cahayaapi1.com/contents/files/81460051299.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917062053.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/79380355708.pdfIn PDF document text
    • https://webrobogo.hu/kepek/29137981773.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130241160d6c---saduwavawelinibojakivo.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/25322849667.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sevevutepinelawirizafure.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/bixibakodo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/64858622d03dd9d05686f8c622aa5460/gibolatekofixe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357e35bba3---24633368117.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/batewexifanagapegasodid.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5o5q935ktset0apoip4tmggngf/73159184870.pdfIn PDF document text
    • http://metall-press.ru/files/nizorisamosaga.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cfeb4aa0---96532587779.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dexemuxomob.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/64278730616.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/donipigidolivilisejolo.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/41847778961.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/89116969906.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/duwabanibi.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/81846176978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=parsing+the+packagePDF 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_off0000b783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB783 10580 bytes
SHA-256: 3e626be6992d86785647beb3c32fab47ff9fb48405111de6ef0ffc3054089b92
font_01_sfnt_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 14812 bytes
SHA-256: 86734f3ae51dea93ed4fe208c9a8643127127fd26098aac1e3e92363ff3a823f
font_02_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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