Malicious PDF — malware analysis report

Static analysis result for SHA-256 690c48a05081829e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 04:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed06fb14fee36100170baf1e050d51b9 SHA-1: 6de5cf7bf54b4c578f8a61c0652702ba2df44ff7 SHA-256: 690c48a05081829e408ba286509a9040c54d922cd02e60298d12fd6548064951
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely for SEO manipulation or to redirect users to malicious content. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89973293037.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/g09iq775f8ed7st421mjno88o1/20842909121.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2e918b352d7486c65aa7ec9b9db756dc/76890901621.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/wofuniwifekajugifovawoxil.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/95683098677.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qnrvkfh8jts2ree7l7n9odijqv/56534649127.pdfIn PDF document text
    • http://babamoleskine.com/files/file/61941010851.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/17461866042.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/18983816128.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/ririjitidi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7655546a---rowujogawax.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/fenadalemadavogaw.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/womelefedini.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/fadefamajinobototive.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25b85e65b---19339184312.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d30ec7477---68675090744.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/67335459226.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/vogenesodule.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/noxudenutodude.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/72782898095.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/lesepojaja.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1634643c36---pimezave.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5ad206b0---baxixadedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=maxtor+m3+user+manualPDF 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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10544 bytes
SHA-256: 989d3167c81b009d72cfb8f1b386dc39316947c58b820964a16f0007ce5e2dce
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 18064 bytes
SHA-256: 6ea0c2f1734e3f8eb30c15d135f677a488434b1da47223359cc317ba111114e5
font_02_sfnt_off0001352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1