Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cb5b58d664b0eb…

MALICIOUS

PDF

90.7 KB Created: 2021-07-29 10:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 815b6121099d135aac2edfd19b59ad57 SHA-1: 59f59527da9f175dcb00fd6926c2750641be2258 SHA-256: 80cb5b58d664b0ebd63d6d78f971bf0e3721f1ae70f6b29900b7657b2e071ec4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rajskiewakacje.pl/userfiles/file/rugokulavivopew.pdf In PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/kodas.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/72dfb36dc315a75b145e9ca4f9345270/68196241418.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3954a3c3ed4f8619852aae60be01aa0e/ferasirelufaseboze.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vatovo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/87444860509.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/31494347491.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/vivigirax.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/bamojupovutimepojama.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b3722785e9ca03a244f936f2c2285373/gejawewoxaxubo.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/dd5a1ce0a4380ead123011d357643dec/73253701430.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/96565258991.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/wetorodevagokonagevaram.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/bobosabupafesag.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/60493297753c7bd8027c2751f117c4bb/21361718491.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c05cbe93c---65677887621.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290051051568.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dc41483a3---sijen.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/9768f413b3cb155fd6c468ba3d192893/mefazog.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fe568b9774c567b968907f153ff5afdc/genisuzitagubaxiteto.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/9c64d9edda7062b62c67e75884febff1/39815190892.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210628_DB775216CCE19975.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608620debb0af---59535453880.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jednbq07hbb783d2q9mmn6f167/bamipunodufa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c56f75741b2947d2b17b37629024dfea/86097580504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fundamentals+of+electric+circuits+6th+edition+solutions+chapter+5PDF 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_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 17004 bytes
SHA-256: bd5555c62333a4b5293facf103196cb442c2b9b71dcd671ce683bf9257fd3d62
font_02_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 11264 bytes
SHA-256: e897a40a240e3d84a06e2da7994a47f8845e63b13162962c99cb979302f51cf7