Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d7f78a5f1e3aa2…

MALICIOUS

PDF

107.5 KB Created: 2021-09-01 11:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ee0d2793155a3d01a6e4d32f386e0f4 SHA-1: da9a175b5bc4c4471a580ceb97079bea759e28c6 SHA-256: e5d7f78a5f1e3aa24c326007953472aae60207e4d856284fb1496d89ed01fed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic findings point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://hnhaa.com/userfiles/tnejp//files/morazateninogut.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16091c95550cfb---jupajutixepa.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ddbe7c71361e6a2cef84c16b28271961/zazimubenerizejefoluwidum.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/fovuf.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/20529928829.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/sexudununujut.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/runenujasusenuretifamife.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/zapedewulunun.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/zowizopu.pdfIn PDF document text
    • https://linker.tw/files/gilazomuvulo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484d513c8e---lawogiriluxufetavabuda.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8a6056b95---ketitefejekawi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e9f366f74bdba8254c32770bf95496f8/wibaluxibitapu.pdfIn PDF document text
    • http://hydrem.ru/images/file/pexedafo.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/fizib.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/biviwugagabusilaledizeme.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd1d5795de272d74597315f57229c827/tosulibonekarobexelawib.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vexal.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb2fd6dff---42251627431.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/vowepubojege.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132b01bff1---85669123510.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ff8mpmva66v1h8ppqbjr63keu0/wupeg.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e3862137---rofajabizir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=microsurgical+subinguinal+varicocelectomyPDF 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_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15573 18564 bytes
SHA-256: 227d292018c991f9e230ab4b9a9e29379e51e2913556f6a3fe12761e01ffc7e2
font_02_sfnt_off000185f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F0 10984 bytes
SHA-256: 7a97f0ff3f8dbbe1e16d712e3221a64e4d81d46f3efdaefda5592959e901280b

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