Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ef5d83d7530fb8…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 10:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 491dc37b8be25c8692ba676799080e45 SHA-1: 008867e3e8dc9eedde43fd1ab7ad356de0bd1dd8 SHA-256: 83ef5d83d7530fb88d9e8446c5dee4a0a6cd77a34cacc70cd5d1299f9459f1fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and disposable hosting domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it is not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=median+of+an+ungrouped+data
    • https://barcelonamedicalcenter.com/files/galeria/files/suvutavinuzurines.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/624324572a16ea0211dcf597937af63b/vutawobofat.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1505007f51---mopowudesesagulibuki.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad9875af9---nimere.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7cf14c41e180dd48ae090e3434d9448d/16454457829.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1f10835183b3d4317c0e3bbb4c600f7e/22379929408.pdf
    • http://solartgaleria.hu/images/file/juwenixavazase.pdf
    • http://3gr-group.com/ci/userfiles/files/73837980071.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741f4306268---40366961739.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a824cacdcfd0db0b2d69e60f42cdf88/tagemiwemaruwel.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17637ce94d---65451427791.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/25f4e9f4b93f1db86eba235d32faa81c/81035223605.pdf
    • http://thienlongadv.com/upload/files/wapesoseboto.pdf
    • https://mmszke.hu/files/file/torowezo.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40a38cdbd42fdeb081ab0bacc0761a2f/vixuzevika.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/i94n96ubp61rh5ojbo8vv31hgf/50630984194.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835d0097ce3---95783426276.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440154b5ca---zibebuzameserabegajufa.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f9af434---wejavafurarug.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a626bc893f0---35524812678.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd870b6edb4---wijekenad.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/xebiv.pdf
    • http://geyikkimya.com/userfiles/upload/file/99468317551.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f1203ce853f25c46fcfef000d227a401/kiwalazep.pdf
    • https://autosaloncenter.com/uploads/file/33099251640.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaad.bin
2345640532c12c13517e633d598d58092b4a9c8ff9465ab5dd4ec616ece5b7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 10552 bytes
font_01_sfnt_off0001029e.bin
3615f704c6aba6f0298ea2ed57e8c16ed56a684247ab764750feba0c746c739f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 18224 bytes
font_02_sfnt_off0001330e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 16792 bytes

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