Malicious PDF — malware analysis report

Static analysis result for SHA-256 8766587b2a2b4f22…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 14:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92974bb15b66014dcf7cabcb519149b1 SHA-1: 979a6fa518adcbbc5ee443cb54d8fd8044731924 SHA-256: 8766587b2a2b4f226aedc01b00abdd05c1fe5bae03a863ddceafca0d472977f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/m3o67hltniissshr5o09loo4j7/bomele.pdf In PDF document text
    • http://budropol.de/Upload/file/65003132668.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/bofexul.pdfIn PDF document text
    • http://e-sportis.com/images/upload/61458959945.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/86257099591.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/4579028225.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/kameradotiwadan.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/83708232714.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/virulo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/7235667879.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/45838312698.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/1550975029.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/bogodotirivasunalego.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a98164f2f---70275857835.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/rebumutegevux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96fe336ff---84262975229.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd4b633cef4f18b09ce18c48d48ab0a9/sizifewoduvazopasaf.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xoraxujaditawoxa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e11184e975---92204758748.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ed9a13a3---67428919250.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa70ecd02---madaramozixajudir.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/sanuvozudis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+applicant+tracking+system+read+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7ff71ba10fc5bfebc1cc3eada2f00a86/kufuzeniz.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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 11080 bytes
SHA-256: 04797a8c4fc427c229b485bdc7e669af0c5fbec37ac317c80fc180fdb317fb21
font_01_sfnt_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 15736 bytes
SHA-256: 49266a85054e3622a68236dbf151924ebfc4b83e770a35a8bbeb05a3d8f58ef9

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