Malicious PDF — malware analysis report

Static analysis result for SHA-256 716486f630ec0123…

MALICIOUS

PDF

91.2 KB Created: 2021-06-25 05:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4906a986fdba857f30dbc85a44f2643d SHA-1: 1eb932455a6f2606ee0fc5cf5711f6f93e6dd4a1 SHA-256: 716486f630ec01236d5f5a357cd27a7d45b1fe78634d7262b46fcfc307c37f2f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious documents or phishing pages, serving as a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/m949u4bddh2nl28a49sj4nul21/zurirubosuxanobar.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d3gsd548etbpq13si6d5o14gvn/95085274235.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/tinidorotulaniroje.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/gejebe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8ad0b7fe---vazezidimumix.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/32d113f60d28a5c54e56f001a41110ec/87349972018.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75e40a8ce---miwireviraxuwud.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8598160a---79984749946.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/14963175232.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k1lo7jh16bbstlt334b5f94s6o/nedotabavomexisosiwuku.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/740f141778cdd7175400f702303d5e26/41489157251.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rezakigezutukobimegada.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/23541387454.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/193330714.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39e949f4e51393e863f861536e289675/ganazerufugelinez.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/4096494679.pdfIn PDF document text
    • https://bem-sa.com/img/file/nixom.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160712758912a8---99888572770.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=importance+of+biological+macromoleculesPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 1764 bytes
SHA-256: 2295dfe4edafdaead1ce718e4c1c79ddfe57650fc648a3525f89a62d8c4c12f5
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 5412 bytes
SHA-256: 8a7bb464315e5af7f3f8e43c006ff6112b7fe89e1fbac014ec1c833df864767b
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 12088 bytes
SHA-256: 7432bdb0885c86d394f12d9728c7b4ea224dd3020729c3c3e74ad85aa6cfe244
font_03_sfnt_off0001486b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16092 bytes
SHA-256: 0e1ac90e4eaf8b1857a29461ee34136313bbbbe88c0ab68b543e42130314d642

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