Malicious PDF — malware analysis report

Static analysis result for SHA-256 75361c6219b9e4b1…

MALICIOUS

PDF

120.5 KB Created: 2021-08-13 00:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 067d99ef73853ce9a882e6a13979d74d SHA-1: b5447953cfba1c02b76289bc00bb3c03ebda6484 SHA-256: 75361c6219b9e4b1b44ad00bf2c15bcc15df7c01c5f8d8d83cc7b16d7f8d0905
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=indian+philosophy+notes+pdf PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a4a3d1f2---buvoto.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/80145454433.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/fezibir.pdfIn PDF document text
    • http://suurelepa.ee/data/file/23553345153.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160869c439e6ec---gisesomusotogedenivopus.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/40837717704.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/86529304852.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kederesidepixojawuraf.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/forilu.pdfIn PDF document text
    • http://omg.su/upload/File/46205448447.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/wakibimizir.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8aaad46807---nolikefus.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/o0r76osj6hk7tldaancvr8esiv/bapesi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29ee91de1a96dea6a99cf2447cfd9f81/41867186937.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/40675957492.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/08d2125452d74d20c2d4e5e004f224ea/jagirejonuxep.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/zituwudikunixiwusokoxepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109caea9d4d6---neviwamolavawilevine.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/q3acmr8emtt4j608ttgh59drm0/nikelegajowo.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ruruju.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a98526b5d4f---xezifugi.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210622162437798092.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/5175090257.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/16sjmfqf0invn2g9dkhulhv7ao/75065640769.pdfIn PDF document text
    • 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_off00017762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F79 10560 bytes
SHA-256: 6e98a94d6ac2caee1fa7519ee3da366fc3a654a47c41b0ae2bcf9e1108e2eb87
font_02_sfnt_off0001a777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A777 16804 bytes
SHA-256: d936a2dbe3d0f21bf63ac842cf6b1e028794e887a2aaaed46b7fb8d1b733b783

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