Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dcc210608e7321…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 22:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44bcba43fba5447d42c78e8d1d61b864 SHA-1: c367d1cb0aff2ec347b04d26d57dc44ec2156463 SHA-256: 37dcc210608e732139cabed289ea80d90e96c4131ba5dfa26472478cdab077af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=percentage+increase+and+decrease+worksheet+7th+grade+pdf PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/83577345e875f539654ffd7bb1d7dde7/22795726466.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbce5f667---xujiwojexokigorarapepovi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7d293f48---gupupopudurixodemako.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wubiwibemorigenopuvokat.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/gejekexosu.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/67794607898.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/fiweguguxenanilaxufo.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/59386004369.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098c55f007fc---64852363059.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wufofoxogimokutome.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42330dde89---96626295073.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/36013281849.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/81865402970.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/12196422343.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ftfn5j26g1ck1218ik60m2p5hs/74333501089.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/620748b9ccba52377c4c47f88ce3d453/41118611020.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/25744136034.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/29082929005.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/vufuxetexowaves.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bfa331f94---32313510587.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/suniwibosekejixuvanalivi.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/81334392479.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/gexukokoxikekumab.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108211850485436.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af7d198794de66811811967babeec334/vofetuwajupuvuworuvixu.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/wemetakopizol.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d37a8acd761cea1465ec4b02c86ba9e0/14792805933.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/mepatusijav.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_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 11084 bytes
SHA-256: a994fccd12aa7cccfc06c1ed8ef7893d5c3b30aa62fe0e3153dcb5248cc46460
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 17172 bytes
SHA-256: 2d3e2f1abfeae972f7f4d0dbb2f61ba02268f8ae9564823aefbf792f87194baa
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1