Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4bb4023944c3a0…

MALICIOUS

PDF

97.1 KB Created: 2021-06-23 10:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3f19f8a561677677980d67e70ac87d3f SHA-1: c93d6abafcda4aa9c18548a6dd75c99e5e32fc12 SHA-256: ae4bb4023944c3a053329a30b01d9ae4fdb708f37a996cb755e6285727583359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d4c03a19---80915515221.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcbd6f4a6---19123243193.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dumimifiwebesapelu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vubikolewovawo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28da01d83---4921319507.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/456a1bae8547e08978d83de55086572c/94625581726.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/pubilatis.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ecd7545ea551c35f2945c008cba724ca/82494633946.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/82929181705.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba79e59ef0bf0fe166396335a4a984a0/82257855187.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xuxexavitivularipubonup.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/85250847722.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e180418a9---2652003161.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781a4625ffb---86458297962.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/48985558817.pdfIn PDF document text
    • http://airsoft1.ro/files/file/poporibezeg.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e19d8547c9f39e8021a3aae0048e10ba/10407180566.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/824f2c69b5f9b07ac5d82241b2828c95/17094123406.pdfIn PDF document text
    • http://dw.bettingbest.rIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chava+book+pdf+marathiPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 5240 bytes
SHA-256: e05b3a7de1a495c260e82a1b1f7ce0793c5a51a6a2443cf022977238c9e2a59e
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 10692 bytes
SHA-256: 9e46fe74d5c196ea7c389c1e14ec8a8987e521ad8bced0cc767fe0ec5f0a9b3e
font_03_sfnt_off00013cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 19868 bytes
SHA-256: 73fdb848fd705b45aaa6916bc5b340f5f1dedf3361809e982491a2754c52a589