Malicious PDF — malware analysis report

Static analysis result for SHA-256 12af5d765fcd4f33…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 10:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: addea8d59545f21f79e36cd7719f1bf0 SHA-1: 4a2656999c3fbe9d98c2541a1fed34f88a6dc75e SHA-256: 12af5d765fcd4f33db344e3ccde56435dfd8fecebd9a0339f43189082982d76b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of many external links is the primary indicator of malicious activity.

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 http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/30ltu229lrm870mmns0ulenh91/lativixetifonolevutun.pdf In PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/subeleb.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/4797809213.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/kafegi.pdfIn PDF document text
    • http://mobil-tech.com/files/60734263069.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/843803166b54b3e43f42be539c302765/63291497522.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612af7d76edd8---26332797651.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/damen.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/puluzizizave.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/65569984059.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/tizorebosaporegu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161092fcdd39db---bonupojadowinu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45c6b4919f---fakerapolom.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f7107e65a88f8a8be105655c365984b6/jolipowo.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/22069316170.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/venuwenuvezepukixenura.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/72pkvd0b77oef1sj2ealda04o5/tatugupujofekit.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e669bdde---zilezisixit.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/finuranezadalozogenapet.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/af94564b5e7ae3ac2e1354f64775fc73/wezisejedaxofirokavurezuv.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/13750805527.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/roxolasubekux.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/g0coomjdr5aucc2p19intpaupt/85087496174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=important+math+formulas+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b7d80eec96aea83227cc341009448050/disivudunavebijagixepena.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10592 bytes
SHA-256: 3ebf1c6d374c787ee62f0ee58b9531b2cd30871ba73e8c6650fbd69ff605c9b8
font_01_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 17652 bytes
SHA-256: 07f13937bd3b5bc7efbbfb9ad1066440a1d432d4ae7d6eed5fae3fe257bb6902

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