Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb35fa51d97d758…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 01:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5ecb8f6ef0d40bbb8bc3bf4cf6e3bb2 SHA-1: 42f70f41d7ad50f4cbd49364ae03b758cd87cc66 SHA-256: efb35fa51d97d7582fcd281c2e5feafe38405bda925dab5b3c9b272224f9fd62
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. The PDF also contains numerous links to external PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • 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
  • 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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/42059f4ee268e08e5c579cb1e3980fe3/gidefodosumevopenukaj.pdf In PDF document text
    • http://angelcabrera.com/FCKfiles/file/mitedorimilowakeworegaso.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6d9b39c07c5e9fe6726fa3988fb141bf/tigusijuwefepak.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8710cc5b---43521552596.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/tobiwoj.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/54314716934.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc244d4c6a0---xixorumoritowu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4e004d71602691284eb2e0f2f520d384/40446361002.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/sonivetoximafujeje.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/mazup.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/36396901538.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a464e041e7daf40c3ad7cd34fc5d226a/11058344739.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/57512507125.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/kugemewiniva.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/53154823097.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/30756743609.pdfIn PDF document text
    • http://derma-dts.de/files/file/33018414123.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/banabasoxedozezuno.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/74147246620.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/fazodasaxifesex.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210722071949.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/65246230923.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/92697676532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=foxit+pdf+editor+free+download+with+crack+for+windows+7PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16248 bytes
SHA-256: 52c09d09801294fb48212dd02e329ec624144f0d46761add3aec4cfce6ce3008
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 11024 bytes
SHA-256: 36ce769f28549bacf9f64624805e139ec73d2e99324130fd2fc8ff5d4f9734ab

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