Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71ef067ce88ad49…

MALICIOUS

PDF

82.7 KB Created: 2021-06-21 15:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ac19e14ff00c8421706c5085768b8b8 SHA-1: e7243f89e0f2aa97aee3e552c1c0a5cd37e52dc4 SHA-256: d71ef067ce88ad4960915f5d181bb2429138d0747a77d4d24fbb9aa54ba273cc
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While the document body is heavily obfuscated, the presence of URLs and the 'link farm' heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/92236842212.pdf In PDF document text
    • http://21cedu.com/pds/userfiles/files/59840576422.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c417a464201---52994411289.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6b8eb133---40576432723.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3da5ee72baee990eae51b43baa14e288/kuxosuxasazoxagekexak.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b05c5bc18---fudevepisodudazix.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c728ddd56ad---24871268395.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f686ffd9175ee8b49cb8ae8307eb991/sovinofibijela.pdfIn PDF document text
    • https://luminex.pl/upload/file/74189374391.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a4dedb08---papimo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/zemoponazevoxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f0f42ff4---galuwirimituxunijiwisuxi.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/66905962453.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/99236296995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=romeo+rajkumar+film+full+moviePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 4636 bytes
SHA-256: 8c0090aada5b04a2dc154128d1f41e8cdfa175291237d3e00205c8b9985758ad
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 11392 bytes
SHA-256: 5f10c252fc303639d5d5cda42e973790c4ad5340b28000c218eafe29885124ce
font_02_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 17248 bytes
SHA-256: 06ee8a6873f6b6948c5d0c469edf508baee7896652af0a74d4d720f108531935
font_03_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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