Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edae64221572712…

MALICIOUS

PDF

127.3 KB Created: 2021-07-04 00:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e4f82292a17b7d364397544c32582ad SHA-1: ab1a6acf3478a4a944d75f123a495a52a6503575 SHA-256: 0edae6422157271240f093fbfc81430a684b5b930c0d50c4d834ef5cc0ffe590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and other potentially malicious sites. The presence of numerous external URIs, including those with UTM parameters, suggests an attempt to direct users to external resources for malicious purposes. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=davidson%27s+100+clinical+cases+3rd+edition PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb34f1254---fakore.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/26760124219.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/54606042305.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/92856050912.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1a5ee5cea4312aec8d242dbfa0c7e60a/kuzenufexonozeturi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5220e587e---97348997728.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/79913002290.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/61237519410.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869e30acb1c---gigeraw.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160997273b7f99---sepekelubamewukegavigedu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/46400658887.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e1da05ee---zasetekik.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609601bb6a19b---renejigulelanex.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e5cec00549bceefe94c330c659382354/22628304894.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d17fbeb9f---mifutemitowajavifi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa2362f53---78608984138.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p16hf1sdokp85d9o838sqvanl0/kuforabefu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a478a674eb9---fulib.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/giruwumivonesewiwe.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/987smeh52di3gl1ngctoilhc16/33898746857.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/049ffe8d2ad4e2483a8379eba89b5881/wupufekegodixowi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mipabe.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_off00018c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C84 10808 bytes
SHA-256: 08d593397289d428a0b28e49ab74f47b96c6f65ef16a66f48927de4008ee79a8
font_01_sfnt_off0001a5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5B4 18512 bytes
SHA-256: 013164e01074724f65d7c2bdc7faa4fb557854edb8007f178f07ba6004570553
font_02_sfnt_off0001d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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