Malicious PDF — malware analysis report

Static analysis result for SHA-256 634fff2a4ce1ece0…

MALICIOUS

PDF

81.3 KB Created: 2021-08-23 17:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ba493b4c5f321cefdb8ce140f300e66 SHA-1: 972bce0f006f7b465c69240c8211f116795aec12 SHA-256: 634fff2a4ce1ece030eb4747d438143bceea369c69cc32fce11ab825e5271c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7358e5b3c13ee0744686c03e21eb79d1/66832301983.pdf In PDF document text
    • https://bloc-immo.com/images/vakuzabupitusa.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/57445673935.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/61267788648.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/mofazenubameri.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tovimefa.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f4c96fbbfc71c469cbd5938cb29aef19/16149545315.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e932884c---wofasagojozukexulafudis.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pgipc4phc1dpc93nsfe00jsmhf/zaniti.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/65601365653.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/37087714406.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/neneb.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/vosenebironijizuzome.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vaserujunel.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/jonunuxoxagisazi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a91283e2---jadurovag.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/wemubawawivusotazogikab.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12de57f442---xadutofejifuzup.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/30200065034.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ba980539c9e89d15f8b0b0d8b2c2ec05/78164872102.pdfIn PDF document text
    • https://x-software.cz/data/file/35941759077.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/20875696938.pdfIn PDF document text
    • http://93564497.com/userfiles/dalorazegazim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=eur+40+is+what+size+in+us+women%27sPDF 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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 10788 bytes
SHA-256: 5a4fb9f2f7ea04918b03c1cf3c8a5475d10dcae3aa0ec23552e494abb79f220a
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 17720 bytes
SHA-256: 1b0eea4a46227900de95ee006713f254eeda191556464e05840e49b95ff72f01

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