Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e51db6381074d8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 04:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6bb3916ea0b7ebe0ee6ae535ff7ff9c SHA-1: 639cea47857704d223ca3b58b303052448f39c94 SHA-256: c6e51db6381074d878d964168098dc156a9ca8fb100837611bb8c5f7e9f472a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various compromised websites, including WordPress installations, attempting to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=prince+of+persia+sands+of+time+download PDF link annotation
    • https://grupa-energia.pl/attachments/file/tajoredorazebisa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef44554f37---18035174963.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pitemas.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f75d2f9b---84316653736.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/53894408132.pdfIn PDF document text
    • http://klenderbio.com/upload/files/ruvami.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/58517295071.pdfIn PDF document text
    • http://tdbm.vn/upload/files/12380804210.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210905075016.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/39117533249.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccec8f23aa---zigulutezasalibuluzox.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/69103406951.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86223032475.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/lolonalokad.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/20117562233.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wididovojovadurevofod.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/41436261336.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/324e1881fec5ab264b7d65559445e781/7356715734.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/74296961776.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/24953049200.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df7f033d8---xumobijapisepotixu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc7d4571---9423334805.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dsif0kmmh5uno3jg414ktujse7/lewokoro.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/nikudejojawoju.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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 18560 bytes
SHA-256: 018d20c4d1cb0d1891b3fbd0ae2ab55ed63f7b50ba49f48b0c47f851a395868a
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 10868 bytes
SHA-256: 84636088f6c2d0ab13dcd923978b3f7de575bda47db485ea62a64a86b33b606e

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