Malicious PDF — malware analysis report

Static analysis result for SHA-256 308da35309dc8882…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 10:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0e550795e0ae42180c1f2a39c46fb6b SHA-1: 6b2f02b1bea1ddae9140e44bbf7d8711958fb4fa SHA-256: 308da35309dc8882fb97b863383dd4559b2b7c81a243c0bf318cb2ac895291fb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94a28f03647bc2d5a21f9365f792d49d/bawovekapujijokizajeniwi.pdf In PDF document text
    • http://www.binghan.my/userfiles/file/runaxisukusep.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/723248bd74b860e34163c38303ada02e/biruwub.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094656d1ad27---24995502646.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d91c8c676---reravaxenofebumi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f6384350a11---88645257021.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/renod.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemagexale.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/12751992436.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078decfcb450---xadowolemiwanufom.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/85305150037.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/koleve.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4e8116e6---fubaberobatokobene.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/bulomewij.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/fabusimoxojix.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/sixunikux.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/29891431516.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/12475556129.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/fonejojuduveliwuto.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/40114225621.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035bdb52ef---kalatomukasolewe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/lijafenafakuzagi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/10766676641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dehydration+feeling+coldPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 16916 bytes
SHA-256: 89fc0495c1f9494ee65f1bb69ce292c841518f7172466e4bdc7fbf606ed54364
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 10700 bytes
SHA-256: 252c7d0ceb21c3c58f2eb830333cd397b5e4d63e7a07a5a49c529268b8d51264

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