Malicious PDF — malware analysis report

Static analysis result for SHA-256 05029bbb69cdc2a2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 07:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e299bfb679d89c8351db967cfb1d127b SHA-1: 8054ae67d7903d60934cec7a8dcdb4f6a97797c0 SHA-256: 05029bbb69cdc2a23bf6b54bfe80954a0fbebc72bac1e258260d6c02945e29bc
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious PDF files suggests a distribution or phishing campaign. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://studiolegalezullo.eu/userfiles/files/gisibasizukupumu.pdf In PDF document text
    • http://healthywithhart.com/res/file/71734178595.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/60776920807.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/52498366498.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///58772527636.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844226a1d92---30667454689.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7a42eae5---vedekapadamedex.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/xexekajekeropezexo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae9830d13---46613843339.pdfIn PDF document text
    • https://susta.vn/userfiles/file/mirosamojarasedagu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4c03705feb5b38ae4dc7aa10c2960d38/pasosugeb.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-5/20210505050602837475.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021082811211720.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1ec4f31d0e05d44185c41a0bfd4d22b3/tazevoxefitixipi.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/nolobejoveg.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1ce57504---dufir.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/zudibexamabatiwumurutuleb.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e016f26045---juvusiluduguj.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/jitukuwugoxipiw.pdfIn PDF document text
    • http://arablift.net/userfiles/file/suzufujoreruzivom.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/6738339766.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/vufulofanijesidera.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3349542cbd71a3349be3fbb8405cf568/vonurevalow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nutcracker+sugar+plum+fairy+piano+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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 20244 bytes
SHA-256: 254cd06c31773b8c0b046f7109630edfc2ec805f7664c48feb6bba05c84d922b
font_01_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 11244 bytes
SHA-256: 4546b9f7581397dc3fc25bde0f0a7c16886f4c070ae6d000e3fbc5d4ebb318e3
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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