Malicious PDF — malware analysis report

Static analysis result for SHA-256 5074380f0018bd55…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0359256af9a12d74758c010911ae9e1 SHA-1: ef2601694b30d2d378447ce125701b1320ad169f SHA-256: 5074380f0018bd55dfa0e458d6f16f045f2a8944cf0945e5b9e07e166b558b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to obscure the final destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to distribute malicious links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/38t6m5ke344gea7p29jaj08lts/83634427611.pdf In PDF document text
    • https://mamap.in/ci/userfiles/files/xukibororolosezusi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30bc1f39e---37745527338.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/75b79012fa5a506f1759e75ef2d6f780/newusesodegofila.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7dcc3a3b---89362393090.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/37619588090.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fbde75fb834faba6fca49e35dec1230b/nivesirosobadetaxaviguduz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7768ecb63e---gefetete.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/88835657810.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437682ace2---98003086342.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/3433601566.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/nafegudoluwititabefutiw.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154357276942.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/jivote.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mugarunop.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d77a2af6---pebumakigaril.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcb7a67816e3bbf49420a23c2b8a2ca4/kuxavonobavo.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/48454993135.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a30d54f6a---sokaz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29eb84ee4---vofufexomuwesujudanit.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/kumunuxulisalew.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/setuzutuforabobipumageke.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42eb71458---xenawukejefasiku.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/gkeod997tfibd5b21h38rf49b4/rekipurovabujatimidemena.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc9f834da---22323868695.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1c7e8a3e82820b068cf74718f916ba96/57365133816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=w+to+aPDF 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_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 9452 bytes
SHA-256: bc0e7d6c2aea5f06f1292acc31c31e569102119b51269ff2322ce8acb8ed3024
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 16688 bytes
SHA-256: 92a73befa64fdb19b43105f49c225ea9564099031c32ddb4fb1fb891590fe07c

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