Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f6dd929024a065…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 21:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a0b326520f6192ded44f701645f818f4 SHA-1: e7bd225b5743fe48a99467cde9c13e1958944f47 SHA-256: 55f6dd929024a06511b216d4b25b94206c6d17c9a3d3f0d07fb766d15d758652
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, many of which host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://imdad-egypt.com/userfiles/file/6030960005.pdf In PDF document text
    • https://soccerauquebec.com/userfiles/file/wikavofotemoxenedugo.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/kidosisaxatov.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/mixejudinu.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/96736009829.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d4me7bcn90ejiai7lguh6pgjss/46729051442.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d4aaaccd164---kafivopuruveza.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/42378833601.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/30549451638.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608027716df57---towujugezub.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e67227bac---65839543073.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/72168881840.pdfIn PDF document text
    • http://planetamama.ru/files/file/fibexarofodegew.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/93095472806.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161058f79d656a---56644986543.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b809cdc73---jinelupusonexurejowufu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610708258ef42---bupajunafok.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/71244532334.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/fugubakep.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/55791055851.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/58525715397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=management+3.0+leading+agile+developers+developing+agile+leaders+pdf+downloadPDF 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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 11348 bytes
SHA-256: c431f25a43729f8a7980d9401ce7a2e74a3f24e515eaf2ee0656b70d2b5165b8
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 21236 bytes
SHA-256: d43b3931291a1ff839cbe793b77e168659afb86247d96ebae954b94e311406e4

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