Malicious PDF — malware analysis report

Static analysis result for SHA-256 e709f44581217d27…

MALICIOUS

PDF

78.3 KB Created: 2021-08-27 08:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 15bac17b6709f75839726ac1eae48e36 SHA-1: 9d192f46379ab8d0de0e59258c181305852247de SHA-256: e709f44581217d2770687b77beb66fb79f43eb7bdb60c2dc97b8e31c10869a42
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://1carl.com/userfiles/file/66200375792.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1cdc3380---32381903009.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kabewaliturab.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0a16bd021d5377090373e8f6491033f1/17127941110.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/6404616537.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a7883f60---vilamomobofilawakebabusir.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/bofizup.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/natine.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/782d8e6046d7f1fc6b10e916484a2ffe/88577362133.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/63614317046.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e25ba66828c---tunepebivavanuwesatonega.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94278414289.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/plhp4u4kmbph3tqdg9l7s8egd3/ladesojibadivon.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309cd07226---foworamagijamasejuzogo.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7f33ae26df3b318952d251eece6009a8/filewimirodalar.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/negexowazilofik.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/72444788991.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c282f7a3d8eec7cdb8bd1e101754c708/38575207565.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c082abf9---92572146594.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/59700456012.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/amdqti18u6fbi5fm5b2qo6eoat/91677516308.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/jipinesixusulaxazidug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=skrillex+scary+monsters+and+nice+sprites+midiPDF 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_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 17388 bytes
SHA-256: 5455a13c4d92aa6d3941db5761bb53643403cd5ae0bd5535487c3e6e725b6fa7
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 11056 bytes
SHA-256: 479155a09eff73fd5130bf39b0e6d31a42b7bd9b62edb5bbff182ccfb9cfe5eb
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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