Malicious PDF — malware analysis report

Static analysis result for SHA-256 370128739644bbea…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 22:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2b6b2aa8e3cc6619df201af364e662af SHA-1: 0566f0d204b8a8f446867d992a8fec2c8f131950 SHA-256: 370128739644bbea11aa4765e84d2220fcb0f8cbbd8668d7cd2463f883a940f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://studioturina.com/userfiles/files/kadujef.pdf In PDF document text
    • http://nigerseedindia.com/uploads/74368949942.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/fejabamakatubekezotevazo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19595203578.pdfIn PDF document text
    • https://tch.lu/files/files/18359809692.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/gorapuforarak.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/gukiretuzikifewekadoriza.pdfIn PDF document text
    • https://dhesient.com/media/21452167403.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/36963346705.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/30512669638.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/wulojuzofuzakigadijubi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/nogusasemejuvejajabimeb.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7e31e63ca25fa83ef8b042f2f45b8f14/tumagekebidixukogex.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/mewutepeviwezodofev.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/nigolimaxuxuvuto.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/47602485116.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/potutufutemolokozil.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f394c89c9c---45442166051.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/makasasewaki.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/rexakusidomelud.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/suzevokevinaliwir.pdfIn PDF document text
    • http://chayka-svg.ru/files/72113585556.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c06de8b9---gevajurezawetare.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/najuwigaxolenalugu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614505d026907---sopekupifemumuridizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=300+free+followers+on+instagramPDF 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_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 10840 bytes
SHA-256: 97b7d3a020e2643f57732df09d5d38d81929dae1beb3d9b14cf7452349fc1c3c
font_01_sfnt_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 16396 bytes
SHA-256: f30e513e5b89af19fc7fc82b88d7723680d541be4c915be311297155f855365a
font_02_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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