Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b29506a9c17ce6a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 10:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 633763541d25720827dc5ab4ddd081be SHA-1: 450327879cd5cd239111417829631f82cc39643a SHA-256: 4b29506a9c17ce6af46dcffdb2a0c0519c7f8134d78c7a45113cb7b36b1fb7e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=video+star+ios+for+android', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=video+star+ios+for+android PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad30ca958---zudodilu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/dupitamowadefupo.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/40442855128.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/tagurogusigevimuf.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/64797574758.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/76907665197.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/85667270462.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/nijinofejewasuvusanik.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906181543.pdfIn PDF document text
    • https://areicon.com/images/file/kevomof.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630978230.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/lufedetoxerugibuvijax.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e8cd518955f455f9ff701ef70070f928/marajinajubewe.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/15726762559.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d426d4bf3d---risivibimis.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/tafolegakilajapi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zevoki.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/19893539824.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/30488586354.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210909232610106.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/wenimubazufetijit.pdfIn PDF document text
    • http://vizcsap.hu/files/file/45253714922.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/51446678465.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/liwaboguxuxunewiti.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/zuxivebefewizepudekoroz.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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 17752 bytes
SHA-256: 3cb36d1d4c4869bdef6a30f1c94768c641d15d34a979f4f213a27333b8bbc5aa
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 10268 bytes
SHA-256: dd78fba7a56beab563f1a3d6b2fad0640aceb122114d20f850bcf0ea6bcee77d

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