Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab8ea96b8e61184…

MALICIOUS

PDF

106.1 KB Created: 2021-08-08 05:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 252efb78dcff8c9aff6566392b198b12 SHA-1: 665eb58fdfbea98ab97420bcfb2f4acb815cc7dc SHA-256: 8ab8ea96b8e61184f7a5a228bf5d41f60bd01c1e4efa27457c33bc8e23ce3930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kleni.cz/userfiles/file/96465907052.pdf In PDF document text
    • http://apvn.info/userfiles/file/mamoz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f21fca3a1a4f736714a3c9888c80b887/49642594854.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9db70b337---viwor.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/47270110203.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/dubonusu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9dda2078541ac5d7017b61b9310c87c5/tadolufekajusafisimejinew.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jjfvbjhnteaod2p99f19c6hu02/77546871296.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/sasitir.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/zatawadanubujav.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0b7f461c670caa755ab11c0e3a65a72c/8043041859.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fcf2e4f9---47237236721.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/tuvixutivasupopagor.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609186859c16e---19436658212.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/68358153607.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/dimebexediso.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/mawonevixuno.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/35864893397.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/54265726340.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607563d1147b2---31104406965.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/rojugibilebipe.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/9362688090.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/70219771670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=swathi+telugu+weekly+pdf+downloadPDF 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_off00013a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A25 17548 bytes
SHA-256: d32063f62edc1bf66c3a083e04fe77c168dbb709bc731c702c0ca2e34d0bbe9a
font_01_sfnt_off00016834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16834 10976 bytes
SHA-256: 10700fb9d5b5072cacae17688f4f23b4c11f542b7fb242d1c946db28538b435f
font_02_sfnt_off0001817f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1817F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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