Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2da5e2c8b3149f7…

MALICIOUS

PDF

88.5 KB Created: 2021-08-02 17:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25c711e9570c5d2aef8179fe70f0447e SHA-1: bd29b0b592b7982877e5085cac51b93eef5a0e92 SHA-256: e2da5e2c8b3149f700af8f8b5801797feab7d60f6c80aad8c6ca8b42d2c51800
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself does not contain readable content, but the presence of numerous external links strongly suggests a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://partnyor.az/userfiles/file/58063757409.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/sibupimujo.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73c704c28---tukitafodezok.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/80858022960.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c60f1cce760b0f62bccd2d09b4bc9161/84671330102.pdf
    • http://calhi1977.com/clients/879053/File/1387342925.pdf
    • http://weifong.tw/fckimages/file/firanebeloramepidofovif.pdf
    • http://planbmedia.hufiles/47185115794.pdf
    • https://equalitas.es/userfiles/file/66187133103.pdf
    • http://abnicum.com/files/file/pavaziwuzodiru.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/85d03f98494972310a1eec2bf42fde86/bozupam.pdf
    • https://stiff.pl/ckfinder/userfiles/files/vivax.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/rorodowazunozekenakamu.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b843a09be3c169ad56739003d47eca8e/9175765036.pdf
    • http://abwingsva.com/uploads/files/nubizedikotofusivob.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/675df9367d3c37f52ac8f95f847c6d4f/37216939433.pdf
    • https://keluargamimpi2.com/contents//files/zurebolomidefo.pdf
    • http://houstontca.org/Content/uploads/files/rovinupafomajabejegeka.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/kakizebumonam.pdf
    • http://3dtechgroup.com/uploads/image/files/58772014308.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b89787a0067---29458373851.pdf
    • http://dancephoto.ru/userfiles/files/kixuxemilodinaruxu.pdf
    • https://machnhaduong.com/images/uploads/files/89231201093.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd4425342---26684525593.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=macbeth%27s+father+is+the+thane+of+cawdor
    • http://irodori.kir.jp/files/file/80316501546.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_off0000f69c.bin
64bbaf24c6c891d48107b4dc1344e65ed75941b7efdccd76a2c6f2e418283cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 10780 bytes
font_01_sfnt_off00010f84.bin
e81a6938cb25cbedb4cd39f27d450a40a0c502787ce44ed2c837ca6025cff3cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 16764 bytes
font_02_sfnt_off00013b03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 16792 bytes