Malicious PDF — malware analysis report

Static analysis result for SHA-256 841409d5ad710c6e…

MALICIOUS

PDF

98.4 KB Created: 2021-07-05 01:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 956bdaf7e226129f6865eaaa72819664 SHA-1: f348fe7e761e0c7786921798d41d83e3e33e8cc5 SHA-256: 841409d5ad710c6e39c09798af99ec691f9a1fdc9dbce74a51dfb435c75c7576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/7b9415c042c798e790100241d0e94330/puwebimiwefeduxogu.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f7fc46b3---jozedofenevonozidevizuvo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a211e56c8e9---18716482548.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/bflktemldf0j1rc3jq0n386qmh/xewetozomewinipigixazuf.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/m77vfht21t5q03ujcq2h11g5en/varopenexivog.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea2078c12---ratadimowuvewubebabiroxi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fapaxezunemag.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/44706380472.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/17471397708.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/danavolifefoletamo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cb91817b3f43eb9ecbf66de0096c68c3/95062277257.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bf6662941e32a171dd0509ba674f599a/rosodovabaxopevi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160903fdc7fc4e---mifisosiganamo.pdfIn PDF document text
    • https://landbar.com/upload/files/90614977266.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b269249b0c3---80423656038.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609461a2d6895---zuxesenovanopo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/1519685198.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c2d4a05a93bd1f6ea97e69e91ddd3144/48787160124.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/151p6vuhmp777hgj9sg2ip3c05/sovatitajepuwararepovozog.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/vowugosisudodelejojumugun.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/50785388a5d9f1330332d9ad3a1c994d/59729844450.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/af20269be294f91efba70764b8538da6/11099535173.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/71028077695.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/63306edc02b6d98a0fa471b5d5b22a90/wutelorivuvojinamix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ncert+math+solution+class+9+chapter+6+exercise+6.1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 18124 bytes
SHA-256: f46e337e6e19c742336b2e06af3a8d4405b20b10148f1dec245e89219ebc59a7
font_02_sfnt_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9C 11272 bytes
SHA-256: cd5feb1c4254950c8e98fd7352a2b19b61e741b80e737d488dd16a984d0d698b