Malicious PDF — malware analysis report

Static analysis result for SHA-256 271110082d97738c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 14:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40b3c06d94bdd1f65feb3832ab5bf8a0 SHA-1: 9a21250c7f381539664f310b196bacb9940dc013 SHA-256: 271110082d97738cee4b8ffc612dacb0d8809807ef974fc951df6a74de5be9c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://merwepizza.com/upload/file/rakunexaxibiruzofubixudap.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80241f027---42272381155.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/187efca8a222655ab856c4361b47646c/xirezaninajapisepo.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/lk7j7nnu13h6pign6lkhrli1em/45869505895.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/33069303398.pdf
    • http://abwrva.com/uploads/files/gavivonivadukubuguzorug.pdf
    • https://anup.bo/images/files/lexaxes.pdf
    • https://total-sport.pl/img/upload/files/48483704150.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5b041686---38273404473.pdf
    • http://alnoorcity.com/userfiles/file/2469926102.pdf
    • http://tipiland.net/upload/file/juboxab.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cb933207594484123c3e5da0d1849a98/fawakegosazuvavakax.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/61763931971.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fatoboxazebexeditomed.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089188ccde68---pafejetorobofonoma.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cb56d354b---kokepufuzodejudaj.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/42036941778.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f78c5d2b---64204681650.pdf
    • http://turagent007.ru/userfiles/file/koxabatipazosudedo.pdf
    • https://taxfirma.com/userfiles/file/gifabimeferuxotip.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/simatunakawopetipu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cours+d%27agronomie+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 16792 bytes
font_01_sfnt_off0000fddf.bin
1373e1e203742dd33be9fb0030c40516f317eec09320a3f2cde9f988624eeca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 10860 bytes
font_02_sfnt_off000116c1.bin
173521429fb38bb04d2c428e3e512f021b228dd31ee7844b5e472bc2b6786989
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 19384 bytes