Malicious PDF — malware analysis report

Static analysis result for SHA-256 79391f4427df6eae…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 04:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ff398a47cd7e1fe1da21969cf481b71 SHA-1: 6c2bab4c2830cd1fedd7e345aaca125777c6d3c8 SHA-256: 79391f4427df6eae6c0fda9ea069895cbf10eb5748662971ff28063ffce66d8a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution vector. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=what+is+the+depth+of+something PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/acfdfecad3738539d371a0ec05cf217b/masufodivakabaz.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/tagaxilagesipinisojote.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/warusabanaparofepulimanus.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/89824605249.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/wemopemajos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110e50e942---tadiwugogubuvebapizaxona.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/20494008b857baf3f41b549d43e316ac/5169741338.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bcd0cfe9---51329069516.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ditenara.pdfIn PDF document text
    • http://namngonviet.com/user-/files/difuwazeb.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/21420986792.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/zefupasoluzuraluxamexixeb.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/takadedigutazamivago.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/41713241319.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/92004155231.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/87548228360.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/78339434253.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/60rphk8b2901na1cmfgfhogva1/gidavodom.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/juxujusofonuteno.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/fuxufomudemujemidemumogit.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/81795900073.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161390fb530061---labeb.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/xadufurunisuwiruv.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/736db6b31f993b63140f6f408e01a78e/sowuronorilaratelaz.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210915_D3A5D15F389B9A78.pdfIn PDF document text
    • 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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 18184 bytes
SHA-256: c8a8fdc750fdcd0ddf6d542da30b0a2e73ed852a65b624efde9e25e23d40a252
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 10792 bytes
SHA-256: 630e2aadf83229c1cab1957ee5c8a249577952d18edb2e730125a74658344ade
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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