Malicious PDF — malware analysis report

Static analysis result for SHA-256 5073940d83683f0b…

MALICIOUS

PDF

70.3 KB Created: 2021-06-23 10:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d70ca9b01d4470b2ba0b71ed75da4f4f SHA-1: 0cab67272c2aecf6233e5d1e52731f835b157a0f SHA-256: 5073940d83683f0b5a0867316f4c3d7c837761e8fd31fcc0e420cb1c58bef18e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, contains references to 'Texas id template pdf', indicating a lure for users seeking identity document templates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qvjfr31lpbr39qv5n8ta939a95/54871925356.pdf In PDF document text
    • https://carparts-fixture.com/file/file/83435357501.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/zofaluwajosor.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/23046271391.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd9d660d1---13651462425.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/92424919335.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85949920ee---48092000097.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/370435a2272617c2386dc0b18243670c/36977632817.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79a95690f---81245173243.pdfIn PDF document text
    • http://fitviewer.de/files/file/80794486943.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/komugaw.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d0b03503b---46280817095.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/17188713968.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/15661995863.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/xepakesozunogi.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/PmAiG5ZyT-k/uplcv?utm_term=texas+id+template+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0F 5108 bytes
SHA-256: bcf6620782a293c3b5392661a94516e7fb17f5db2fc6be62c6412c34fd975dc4
font_01_sfnt_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 11504 bytes
SHA-256: c1797bd884b94911c4051b5c7387b9cc148d7bcccc4ae25627c0948ee6f1c038