Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28721553608d18f…

MALICIOUS

PDF

100.1 KB Created: 2021-09-03 11:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1740215ec14a0f2830006a312fae575b SHA-1: 6f9c107748215b85e8bc36d06aac6c7b960ddf51 SHA-256: d28721553608d18f15e684a63ad5b45b60233454e753cbde2fab1f3270d75c5f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=enfermedades+de+la+neurona+motora+superior+e+inferior+pdf PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238f91531b---29889756049.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d4cb007a---fomib.pdfIn PDF document text
    • http://artediapharma.com/upload/files/16722993921.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae701258753---67204967197.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/995619aa16e5c29cd483e522e5b40799/kozagevovan.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e9cac217e65937c214c34e2f559ac45f/26928731520.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2o3vhd5iaqr069b3s3ndiecdga/lomeripujimufikavofagi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cd2fee473457f2289790cfa5b9b97101/47499185950.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fa60e6c9---73943069705.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5cc5fd9b---dazisujesuvidagixuruwi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f297ddcd---fenimibavuvavi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed8e6330b---51898357922.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/92189977413.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff484f55a65---72706897046.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6gn3o3pps8sh16f29i9mib0eps/96950242141.pdfIn PDF document text
    • https://davnosti.ru/upload/43572158314.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/mipenu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/56724903445.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/80292682790.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b268ac9af7b---zomuzosorik.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/bilozibuvela.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/5674617854.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6d78d9a27dcf60a02a7a3358c93281f/60011955218.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sanuzopebefodakofe.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_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 10740 bytes
SHA-256: b1948a061f4958042d8a23c5379421e4398f543be4e9b902deebb6a7e7f60a8e
font_02_sfnt_off00014bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF5 21100 bytes
SHA-256: b1c920c353d5895991435a73318a95d343f33381707214f52fa7f974d0064c49

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