Malicious PDF — malware analysis report

Static analysis result for SHA-256 2094688d08eeb2d1…

MALICIOUS

PDF

126.1 KB Created: 2021-06-19 09:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a623b0c73313136530f0e208f63db61d SHA-1: 9f342feb4cd1d77d046a97a98c8e385d1e3b661e SHA-256: 2094688d08eeb2d190b64c29be6e4c9d002245951fcdede5eef9e37b4a600b4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://alexlunacoach.com/img/editor/file/20521222670.pdf In PDF document text
    • http://ehs1958.org/clients/73155/File/xozofew.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076028f0fca1---xagaxavod.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/50484429987.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fc20dd1162b6a56ed4da157558a97ba2/lemebunivu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/39469044369.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0e1469ec0e0ad108711408a9d5b356be/71936430910.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/setonasiwilol.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xuwimapewikeluv.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e0d1522d---jekojomabosida.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c53df771c02---78558651140.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/17291665206.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sck974rd6p3pid2sv2m6skaef1/mikabifotowiva.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/65837125009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=3+phase+potential+transformer+connection+diagramPDF 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://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_off00019454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19454 5636 bytes
SHA-256: 448f8e7676fecd85e5529faf24c30a2da838497e4a22f2530b60d04cf8eff6c2
font_01_sfnt_off0001a74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A74F 14200 bytes
SHA-256: 2531c533b50b7ee6ae170ded6643add937372375876092bb637cf3ae4b47a73d
font_02_sfnt_off0001d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D57F 16092 bytes
SHA-256: 19534af26923dfb65812bd3f0c956d42f45ebded38aa67e331123d270ebe72ab