Malicious PDF — malware analysis report

Static analysis result for SHA-256 052c67d5c3cd5497…

MALICIOUS

PDF

122.9 KB Created: 2021-07-06 17:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9684d64fca9f75c9d38061ec5c0a9ae5 SHA-1: 0302a32677d9667737dd8466b9a61e1cdccdb0cc SHA-256: 052c67d5c3cd549790d51de358f64b909f4a74e0721178116c91147469cc2804
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The file's structure and numerous external links align with tactics used to distribute malware or conduct phishing campaigns.

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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/247f79bdbe3ae89f7a8b7aad96d94344/81678856246.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607addcbafae6---85458902857.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/83227578868.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93aee79549---53757547377.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e4f1e08f7159087fa950874df774e802/tewox.pdfIn PDF document text
    • http://secretinvitation.net/images/files/91374592065.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/333d9e26f52eee52a5e0a74b1425eb0e/rogakibubifovim.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/24164202875.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4cedc3547f59b1e1ffaf845b656e9fcd/fotozudo.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/3917944397.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608af0fd53960---wafimisodusuribefelovo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/56530771963.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd94cb3701---37867155129.pdfIn PDF document text
    • http://topas.lt/userfiles/file/wabukujadurubunuwof.pdfIn PDF document text
    • http://esejsc.com/upload/files/lomowaroxojegel.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/533b1ff4d95f677259b9252426999ead/mokedugawubibetuz.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/raxer.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/mibulufuvilomenusuk.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e59f2273faef96b59c4ebf71bceb91e5/1823764829.pdfIn PDF document text
    • https://everestart.com/images/stories/file/kikedixivutot.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da77efce4---85561702981.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/12125825819.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c0c86103f---tavuwoxadopiwazazaxuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=difference+between+entrepreneur+and+intrapreneur+in+tabular+formPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19228 10940 bytes
SHA-256: 9f62467f3848f0ef6b538341a43efd78a0652682cf827d13f894f878e3786e13
font_02_sfnt_off0001ab50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB50 18852 bytes
SHA-256: 78b631aa398de8a589fb6002c4b203c978d93b4b9543c09978000684dcad27bb

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