Malicious PDF — malware analysis report

Static analysis result for SHA-256 4725553c4c732a29…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 23:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 39e1f8ba6a9266fead62f16671d0ba54 SHA-1: e59a3a1f07203488005956114247d921b43af82a SHA-256: 4725553c4c732a29c3268b649a109be57758dfa57efb27293ef632579ff09445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF suggest it is part of a campaign to lure unsuspecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=seven+deadly+sins+anime+gluttony PDF link annotation
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16090d42f4ae2e---86967446820.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/58b350fe3edb2a7c8bf556879aa4c39b/88843034287.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f88ec4bfd---zurisetun.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hk6qsrkmna19skdp8tdidksoer/58364028665.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609113c839ab6---xubobowenufadulatin.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cab9f5cb---jegovobugusesunipamekugol.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2a8f021ba62974d7fb784092ddf1d7a2/vebanutam.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea34bc5588---zirijanasadekuvelabiduju.pdfIn PDF document text
    • https://cecprint.com/images/file/20655547525.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aba148d1---81370937544.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9627282c4797eec905a0cf35a00e50c7/mijatonezokutufitisewoje.pdfIn PDF document text
    • http://secretinvitation.net/images/files/wiwijolorodarujexu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e5057bd62---duvituwolizumumuzebelib.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/737bc76d0337dd98c2de9c913b46c8f0/66788777027.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/abbf859787a3aa77fe7f01b63d8312cc/xuvidugebotagaro.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/65963926169.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/20232063559.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/92933909460.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mizulofanutugavisasudukij.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aa9b5009---mojijagapovowamiritane.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6121edeeb---vitojokazod.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/34372016159.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d47b13285---rurefinanudedit.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10844 bytes
SHA-256: 4f5a8e4f0dccb66dc8ccd65226a775a021c7ad7b719fef648ac6f1fce61606fe
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 17648 bytes
SHA-256: c5ce44457de66a11d24d5912dcf63260ed0bbcfec26c87b87459842fc98b7fc2

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