Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c754bb1cd103f80…

MALICIOUS

PDF

114.1 KB Created: 2021-07-31 04:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 47586b6d2989d261f3a9c811a4356b0b SHA-1: 9d77706b1084631a0abc7bc8c71dc3c44fc3f3ff SHA-256: 3c754bb1cd103f80c3cf5e6e4c8546c542c425c95e18a1825c0f0d6482b9b81f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf847739d8---55528751174.pdf In PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7dbda32b---77753013231.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/62c7iqur9t93khls820bsnrnv7/19136862972.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5fe006c3b---sezazaloxisimafukox.pdfIn PDF document text
    • http://haai.org/upload/file/fojizuburimexe.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/63031076466.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f73e4cc28f79b6152b1912b9050e2915/pikuziki.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C6922CDC2D8.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/90228275931.pdfIn PDF document text
    • https://eventaipei.com/upload/files/339822435.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16082df1118c12---nulijupiz.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/1929126260.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fad94f883---rizorodopo.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/mikilev.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/47841668341.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/93527175069.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/r5s5mtvtededfcs84ndkapkd44/jirizutovonagidomotuf.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcfa72f5e---27223510963.pdfIn PDF document text
    • https://edusfera.pl/upload/file/lumof.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/zasuvavisujapomavisomifel.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/de524d58bde67d4a572878e862e57898/44705855729.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_030047.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4f7bb7f7d456bbea34d1b6c72fddc000/tadididanuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lecciones+preliminares+de+filosof%C3%ADa+resumen+lecci%C3%B3n+4PDF 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_off000152d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE8 20016 bytes
SHA-256: 0c07914d04c4e1bf78b56473acceaf2caad83a0b2aacc8c585ca1f7a63290180
font_02_sfnt_off00019dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DBC 11020 bytes
SHA-256: 64cc6b85d48a88a4fc3a2b288c507ce53fba445b433856202dca707e1ab4d161

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