Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70d79d184b67cdb…

MALICIOUS

PDF

95.1 KB Created: 2021-09-15 15:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 225b1b41081cf12f5d65fcea7f9e3eb5 SHA-1: 47a02e915a7c94dbc75bba274db20eb0db2d9978 SHA-256: d70d79d184b67cdb39927706c8e4860be547d25a4f7b49c7ea5bf95306476ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The document's structure and the presence of multiple compromised CMS upload links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://medvor.ru/uplcv?utm_term=dhoom+3+game+mod+apk PDF link annotation
    • http://quangcaosms.org/media/ftp/file/zukabax.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/nusuzex.pdfIn PDF document text
    • https://ags-car.com/upload/files/7890751100.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/relavumolawa.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/lajetiwugoxebu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/073f197ea495080d1e991390871886bb/80456333639.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/gotos.pdfIn PDF document text
    • http://hmed.vn/upload/files/ribibonarilewaso.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tiduvemorokow.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/84285842951.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/goxijotixunubivuvad.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/biridixiravudebamer.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/kakujanuzigazijisepumusit.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4245bfda4143e67f4fbc12b16df9ed2c/27410537649.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360b1b73ec7---tusevolowagaposibi.pdfIn PDF document text
    • http://podushka.by/files/files/timipufifak.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/nufuvuzasukuju.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/lamojenaf.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/48548301271.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/38628502705.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109151949353592.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/pifatazogomuzofepego.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/85183696155.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/tolirutudabivikapebinu.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/darorinadaz.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 10496 bytes
SHA-256: f9c7007bb86e38c663523fdead2eb08e8a89ccc44f30d337eb5fb7af1f6d1396
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 24756 bytes
SHA-256: de0f27f147e750ac0ce71f3fe7fde553d9fe69d3a9837b42911757e0ec8dc142
font_04_sfnt_off00015547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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