Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1290f63e30576f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 06:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffd2b0acef0eaef8825984dde57ff930 SHA-1: cd75686c20a665828fedbf97dc855b070fdb646a SHA-256: 1c1290f63e30576fa673e96ed9565dd2bd276e02c13e412321f7e33d356a71f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious content hosted on compromised WordPress sites. The presence of numerous external URIs, including those pointing to compromised CMS upload storage, strongly suggests an attempt to distribute further malware or phishing content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/00636d284348f29e5ccaafa90ff72e90/repolofavutakijegikozazil.pdf In PDF document text
    • https://98ing.com/upload/ck/files/20210901_125132.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/bugujeziwozemijaridi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/malipakukarifitete.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/bapukoko.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/refukiwobadategazisi.pdfIn PDF document text
    • http://benly-carson.com/product/files/21390719847.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d60c459---61233842350.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913042352.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/83254891717.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/de698a44915cb8a483ee189b76e4ab10/datexep.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/tinazoludureda.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/76a1846c25f47f2b222fe8413926d551/9808403226.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328733baea4---73461080451.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/54540577864.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/guxaw.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/88695744012.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/nusagolirebonikotolisa.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/9791737902.pdfIn PDF document text
    • http://kasargod.net/uploads/file/91884344901.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/83160414603.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/97630338506.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tezigabivojubavunokudi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc47fbbe52---kovadujapedivi.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021914_81920_274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gta+vice+city+game+download+for+android+mob+orgPDF 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_off0000b9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 15324 bytes
SHA-256: 6ebf53982d81b76082fee44721a5094a5cd44ddf1a5b3d7988ca114383b85928
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 11096 bytes
SHA-256: 48b543d3deeb68bdb73d945e2a808ebb8c863b755523d7f644849b7eed6440ba
font_02_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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