Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0cf32bece1ea78…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 00:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 75967558da1fc17d313f3c9ea6ff85de SHA-1: d62e9a95019ba9c3bb08e6dbea0fda900b154b6e SHA-256: 8c0cf32bece1ea78d706df4f0950f5fe3832a383cfc9b4fe9f1abbab356c0486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd1e8a298---nuvisegadujes.pdf In PDF document text
    • http://centurionim.com/userfile/batiment/file/gimasubosalutaxim.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/poveboruvezeweko.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb67252cb---momukapijaluxaguwegudo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7b85f12d396274e74494b00f954e883f/juguboma.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/xoxefosuwid.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/18913950880ae0e532c36a6709d46f21/pirojirokulakidugaweve.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/noxupaz.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/fabozojim.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25a271fed---xofejubodagewabijamafi.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/13590081377.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db9ce62944c---25292721865.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/52bf5212eb925f1753069539bb5f7fea/xepijajaru.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/77926961162.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bm79vgclm5tcvihj8bjmh602s9/34502447660.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/zavodokakekev.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/63063485322.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/lavusiriwalipile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f534a82f---30902690638.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f741c81b22391220237c399c2006638e/muzuzizisadimosu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d41123c44fc39acb314dd1fdbc4a7196/gudutumogarel.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/verekopazisagiga.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/cc526b30e41325cf0148371118ca6cc8/20433780553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=scary+stories+to+read+onlinePDF 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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 17076 bytes
SHA-256: 4dc549882223a20ef96f92bc950144c5dd23120d0ae7b00492277293627c14c0
font_01_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 10552 bytes
SHA-256: a9d80257eb0da8cad6274e4825c9d2b5af09d0b18c059152f588aeef879c5cf5

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