Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3153cdf1a37f3d…

MALICIOUS

PDF

93.4 KB Created: 2021-08-01 22:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 992791fd39a66ac18d0c152dea766de6 SHA-1: cf833d190822ee4590f11b969c0df8a0a211c924 SHA-256: be3153cdf1a37f3d597c7bacd7cd7ae7c702658c8ab8a78f335c04dc287cb03d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/94cu3frpcuaimkoppd3jpa9ht3/83301477186.pdf In PDF document text
    • https://vestol.bg/files/file/mejum.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a1d4128d2---jofozesasejakuj.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fisusabigomaditukite.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/35998304656.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/rozegasix.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210704064649.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096fbe0d01de---rafafaromusotaju.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/800f7170382d7ce979e5084d5367b604/lewilivapan.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/dixukovozow.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/81336315524.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/gatovodaw.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/36092944333.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/28894c604f06c0aa5ab399e19081e861/13387888558.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e6c862a6---72794509932.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d17caae201bcad7c95247c1188f25b67/7530208985.pdfIn PDF document text
    • http://skisun.it/userfiles/files/76644542440.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f5aff8996dc8850b92323c967b694238/kosujedipuzikafe.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/77555405413.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3aa6b0780---25976459910.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16099af950598b---8186519563.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vasedofokavisogisufaw.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fca62c14927---23764803396.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/97223143586.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d3b2951e19611cfb5291c2aec7dc2374/48933953273.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb42802dc4---667512503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=which+roomba+has+room+mappingPDF 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_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 17852 bytes
SHA-256: 1e7cc1bca7da9cb7c6f9d466fa820e34deb1a4704fd91f3aece8e7c0832e43f7
font_02_sfnt_off00014ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC1 10676 bytes
SHA-256: 1c6882eea165c7386ca42d6c2da669eb0f792309f22dae7c2144d8472f6e238e