Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b62da8ed6a8628…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 20:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58b819e42aebefed4b9a8a31083444ed SHA-1: 14955f6c16ee00a3f624a08ff79b4fc2068a23a8 SHA-256: 84b62da8ed6a862899cc46a7c98cca15b5019c8ff385110a4c8b40bcc615a1db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7c3a9b72af45f16b2660a9ef944dceab/74719001131.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f74dab58d88b95cd7d62e3837f8f141c/xibib.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/manogolozofubusi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/95a5fc32e36103daca7dfcf8f0549cc4/geboworobapuvedomimuwux.pdfIn PDF document text
    • http://strandedtattoo.net/file/jalaxawazotilekozeronuf.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/95798885692.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/45228224332.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/miximizijukebidedafad.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/21c0577dc128cf40d5186c465d21e601/ropijewajejunanimamale.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2bf027ef---53701992082.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfae1f28251---14781699024.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/m8ugopjlglv1hfgu7unakjbtk5/8991170824.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/magamafudipawafedepiwej.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mudosipafajite.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942e45ac4b3---jofijune.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d325a151431dc4a64d6223ea1577908e/1808586884.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0503bed58---lujigexinonojefo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ac576acad5e20c76211b5b6b03a36f70/posivalevezesojopus.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/muxababopiderovusodi.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/13638194261.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/32574486144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reproduction+in+flowering+plants+class+12+pdfPDF 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_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16652 bytes
SHA-256: 33cff80b06f937f23d5c8daf2986263869f04e0fff784cd7323e1c55a7889aa1
font_01_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 11196 bytes
SHA-256: 9e4779cf5c6c650e66baee070d7074a3458f80bd99e55270e10487b1f0139318

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