Malicious PDF — malware analysis report

Static analysis result for SHA-256 760bf33746cbcae0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 16:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db41499a8843368c459d61a9d6e61b38 SHA-1: 07111e6dd96b645a9b48d408e49556ca4c2af4f5 SHA-256: 760bf33746cbcae0fce4cd30850bd99f1c405a2d6ec6cc4d6ccebb70c800413f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sonet.vn/uploads/images/files/kaposu.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2610e4f7f9ef2d5671f47ef678c485cd/15075639541.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b7f8dfaf5---poluzuso.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4ee2f02a14eb2658fbf7268af6ef0c69/lozaneja.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611472e280f44---77730491213.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8d320ff92fcce40a9e6ac01774c0b428/22562376083.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/b573oavgrbqk73rt6r2kpeuglt/60409187813.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/84264654334.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917a48760be---10989087718.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/5332690617.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c029debc22b6f4b837c5d06254759d01/25102490019.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/22793677831.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u1ibj42br2ush15osaoiaok9a4/97103930107.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210825082724.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/38621033947.pdfIn PDF document text
    • http://land89.com/ckupload/files/jivug.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/91090224979.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kutodado.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/durotube.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9b5777637508e56fd97bbec20a8e442b/nunedumife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=data+confidentiality+in+cryptographyPDF 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_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 10848 bytes
SHA-256: 5821bed2c6280f03c9231df5ca1f3468402a15d4917c365f618d671b0f8f935d
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 16760 bytes
SHA-256: 9b3527f83d8cdb7ccd5634a723a93bf902345d11a9c6ef4f7bda2f4c585698e6

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