Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa3825b6f0eff7c…

MALICIOUS

PDF

90.5 KB Created: 2021-06-18 02:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb35251c536d818da4c8b9516dc77e23 SHA-1: 9a28bbdd29bed4afa8cdba732dcdd8a13ca3c111 SHA-256: 1aa3825b6f0eff7ca7cb3d7b59dcf3b6270dd5b2c8fa2eccbc9eacc5d6ea4026
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=khilafat+o+malookiat+original+pdf PDF link annotation
    • https://mayurherbal.com/userfiles/file/84178685493.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/pibixekiliguxuxafijuwoges.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ogfuldjb2c6a9un2p1j8t1qsv0/58173280184.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/9386251693.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/51du83gv4564mfkjvcisrit1uc/81680631596.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/u9so17jlkp57d56lcp3ogp5vdh/46186227863.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/lk7j7nnu13h6pign6lkhrli1em/45869505895.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72db67e39---didikawetufeseliwenef.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608065127322b---75468348451.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kowusulivitesa.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lccnscnq89ssiim98h0hneuec/femenoraluwame.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lefazilipobo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf155f063---pusimuturiz.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9bc5acd9a8c5f834f71a7510b0dec249/kabetakizodororozumu.pdfIn PDF document text
    • https://digireg.se/upload/49052983645.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e32909e33---xiwotita.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ee08ce80---gavevawilapozujavawor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013173.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13173 23368 bytes
SHA-256: d7dc7c8a338f0c56a296f244a3233d88f0e09c788338fd566548eb46f59a8a70
font_00_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 5312 bytes
SHA-256: da763afb4da4e61ea8d6848338e53b4c6eade84610f91c438f367b283d566d95
font_01_sfnt_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 11516 bytes
SHA-256: 8bd1008b10df7d0bfd861600619ae7afbdc5643f7a1cc4f0a3b2b0d4458e2b64

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