Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4423dd254b934a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 05:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23dfbd37ee3d598428bf7a20421ba6cc SHA-1: 0e6374d7faef364ae8cb42dbed8fabd5d50cf145 SHA-256: ae4423dd254b934aae880e6bb8f30413e61f5b236a1e155ef5952ceaf73a5961
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm, a common technique for phishing or malware distribution. Several heuristics indicate the presence of links to potentially compromised or disposable hosting, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://soosanfix.com/upload/fckeditor/file/degufisekunikakelev.pdf In PDF document text
    • http://slsnn.ru/content/files/47181454462.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/57481338664.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/540b54c0af45de09875aeb85e64fb000/86306364371.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/gakodajelafetikes.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kikevokadixelekaroza.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/bukoxozenazoxokedimakipux.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gobazasiseviluvi.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/gopurobopeligajesufelevu.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/18713588311.pdfIn PDF document text
    • https://rinducm1.com/contents/files/pizunagatevak.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/71404959565.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/6483511327.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9b786590---28007992988.pdfIn PDF document text
    • http://rayanchem.com/d/files/40051152577.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/ketaf.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/77942773776.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vurepokomoxez.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9867321536c963bc8fb075a3ec0b094c/ruzemiw.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/56040728478.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/9266566644.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/72035553049.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/vezovafejifik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apps+similar+to+movieboxPDF 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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 10600 bytes
SHA-256: d9389d5277f8b8e1a5ef19b9687cfb369c4ffffe918e0d866e863ee50a6219d3
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 17988 bytes
SHA-256: df8edb56c5c8fb066e7385d35761b775bb45eddcad3589981c8cbcc3ebf83939
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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