Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b22bdc06c68dfa…

MALICIOUS

PDF

78.2 KB Created: 2021-08-09 19:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6ac08c9b3610c075e6ef0f6ec9b09dab SHA-1: 4ee601462510082d4c851a8d5baa779aebd6c3e3 SHA-256: b9b22bdc06c68dfa25914e600fe75b7286e8a2c07e0d7fef568ef0838a3a3b1d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/cd6d9662a96ade2faf2bfcb11f258aff/376277235.pdf In PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/51d8a07422af61ff92359750071e9c0f/45858329466.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/nuneti.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7695ab236abb0474cdafd54e6818557d/79632377202.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/bekibijizotosi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e198cd1e3b---77133557761.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6094047819.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/66533619961.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/53286170799.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d1e26edd149c131bfbb974b2285811bc/23128898118.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096133b6e670---mitat.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052517354680.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b797c0df24---54740143314.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/vuvorutijojuk.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/58790221422.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c94a96da3---xexudajusadupap.pdfIn PDF document text
    • https://fishuntpesca.it/file/rufakemilawibuvotamam.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0231547980b32002123b14074907c7b4/muziw.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b0534225a8e6b05aad13ff6fdaaf7d6f/78343600591.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f437eca48---redevijuzoro.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bamejutomi.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/39120838913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2019+polaris+rzr+1000+service+manualPDF 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://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_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 11028 bytes
SHA-256: 24c264f803d734e8f99e7cbc37583c808bef9dccf46a542dbb8d61aade66b41e
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 17532 bytes
SHA-256: 7697fe69f89143e21c2a5a40f936d5968fe7a870bcb933867097570eb4f16a16
font_02_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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