Malicious PDF — malware analysis report

Static analysis result for SHA-256 3360b2d1fc2ca8e1…

MALICIOUS

PDF

92.7 KB Created: 2021-04-28 15:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a570a49e89d7429f4ca98036a0e60fdd SHA-1: 8b9e0aadfb6928aac597d7876252c98c734ec85f SHA-256: 3360b2d1fc2ca8e1a17946e3118478c8b656a8717d5071b2c3acf7d74e1cab7b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f79a2393e9c9e21b2f158a9186edcb51/82547767532.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/nomimifosevixubux.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd71edb3c5764b0ea925bfd36c184adf/74073882897.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/67978508097.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b86a97765---54704689025.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084269da07c4---69062622387.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e72bc2207---50581913485.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/985347982968d635ae6e4e9f7977c01c/katofejumeladixakakosiga.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dbc14958---57831287337.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9688429b5---gevenavazepalijefe.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dgkt5o7aa5gg2frg02p60r6dt7/ritebavafitomemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=beetalk+apk+ios+2.+3.+6PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d342de2b89---2433385221.pdfIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 3432 bytes
SHA-256: fa4567c866833e362bd48d52b4bf42b4f3bc27bd66e4aa1e9ab9a4c68344c297
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 5312 bytes
SHA-256: 2a0908ed0915725477de6c18aae0dd2a6d729c3058953b1d7df2dce777e8e888
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 8256 bytes
SHA-256: 22ddabe226b21b4368405a4fba48e900f06a21e0b72a010ba7c0a10fefe287dc
font_03_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 11488 bytes
SHA-256: 9ecc4c01e1d6ac1a5c7a9be6dbfd8ccaf0f84d536ab193f1ab98a706fbd2f259
font_04_sfnt_off00015022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15022 16108 bytes
SHA-256: 40b4972c50c88d393489be5bde3d81a1619b37e5b87fab5a2fbd656868057354

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