Malicious PDF — malware analysis report

Static analysis result for SHA-256 774b834fd15e394b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 09:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a07a0518b3f2439279d03e70357b4e3 SHA-1: eb5537bd5cc2aab4d2e53882d6462c95b04b4966 SHA-256: 774b834fd15e394b632998a0c8c0558679c5073b9c28f6baa12dbbd1b1c84205
164 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 or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=afcat+general+awareness+questions+with+answers+pdf PDF link annotation
    • http://varosom.hu/userfiles/files/tukuzebaxiraladija.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/11d9012d4f621679799f87e8382e6376/22760925268.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/70035009362.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/92011144779.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s2eskif33e74q4o12uuecoicb5/2264500837.pdfIn PDF document text
    • https://clickbox.ro/images/file/21496585986.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/davuvujuvilalaviduvug.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba1b56ff91581bb711146e2e573a0595/zepiz.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/42941319808.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/77011544820.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/31655831365.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/13789272038.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/23379995684.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fadodezalijawoj.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7935870eecf83aeb296fbc815c419dc9/rokevinisure.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/duribofux.pdfIn PDF document text
    • http://mebco.ru/images/file/72954990133.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/27410664466.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/13833834723.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffa41e29a---kubasefe.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/92517466001.pdfIn PDF document text
    • http://parafiasadkowice.pl/pliki/41937493374.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/lafozof.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_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 17872 bytes
SHA-256: e81ac43df8980b41cca4a5b8c7d384e372a1ea2623545e14fbb63b75dc33ebdd
font_01_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 11212 bytes
SHA-256: 02a2defbff8ccb918566cdfde7aa8d4baaf360dfc548c0a2cb06e7af41dc856c
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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