Malicious PDF — malware analysis report

Static analysis result for SHA-256 6653493738355aa4…

MALICIOUS

PDF

90.4 KB Created: 2021-07-30 06:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 49c7ad70413a056452e5e24e6ede455e SHA-1: fd4b96948832e3c6737286f59b71d628f584890d SHA-256: 6653493738355aa48aabe381f4826b06e9e0b7b8479833e847fa1fccec3721a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content or phishing attempts. The presence of external URIs and the nature of the link farm suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://catamma.ru/uplcv?utm_term=how+to+play+snakes+and+ladders+in+afrikaans PDF link annotation
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fb334b328c735ea309ca7bfd00ddc9b1/2401135916.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/91054166090.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/94566690860.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8854c9d20d6bd82536b6511758163f1d/48085405057.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/avq7s5l5krl67v974j927kbeqv/tokimulosixomava.pdfIn PDF document text
    • https://krossi.ru/images/content/files/wulidizisuxorovojazeruzir.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c918388ff8---15786313767.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/pomomupivomewepir.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/35692687865.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1vru4kl98kk09afh3kgn2p1fm3/81048670867.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/xopanofiwexu.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9frd8gpuckq3kn6g8sqqucukc7/sujav.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d71955927---saniv.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c44b78375610b97f3ab70aec59a2659b/zigukan.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b00296f86da95cd5ef0702d5cce09433/sudixeroguzeviroluba.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6fgj16ri1125ebmv1f6h6n8hn3/tefilotuwogixu.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/dexujifoposetasuzuk.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2f6132732527c9386384a97fdcc59c62/vizabosokuvidafabopepunoz.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/83956493624.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210611_B7A863DAFEB9FCDF.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f563f8f2a40358ba975b9cbeca4e236b/nalumowodufujivolix.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7f280f1d3ac941eb0f9a73c23b7fbd10/fubapukasido.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f737f1674---87604833305.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/fanidujafulazizotifada.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_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 10776 bytes
SHA-256: b45a2165149cf1b537e2bcfdb21c7e3c53e49a89d29310cd3e7039934b8ee9e3
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 3056 bytes
SHA-256: e4b5697ff1933e1395aaba3773ad54a6d952921db876aadbfca9b4979f4384f2
font_02_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 21784 bytes
SHA-256: 8204d1519153ff06076189dd314aef8001f2e6acb6c66e5e215c2a1a737c3896
font_04_sfnt_off00013f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F00 17264 bytes
SHA-256: 15ea5ca9d05b1c0414cb02361ade371074089f03fdf193711bf6ac78822b2540

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