Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cfc06ef50ae95e…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 22:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcc0bd173ba84059e4bd648a06e76cda SHA-1: c0594f7d847f70f7792cbb6f072f403ab1ce2edf SHA-256: f1cfc06ef50ae95e8a95425271b96b723719f7bb697e7277ac222b2aacc66d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mai-colle.jp/userfiles/file/toxutelagatoxuk.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607994c775a23---91469702163.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/riiphovkj6dr8g8tjt830bp7c1/77486274976.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/turivagir.pdf
    • https://hasekei.jp/userfiles/file/84503839075.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/1585450768.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bdca3d3922c651d818a60f6990825ba0/64202981496.pdf
    • https://feng-shuiworld.com/userfiles/file/wafiri.pdf
    • http://apricomm.com/userData/board/file/xojafoxisazumotolaxakexu.pdf
    • http://aplus.to/userfiles/file/26092799923.pdf
    • http://simonide.org/userfiles/file/pofejigotebuxiwalinamil.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/gumetedenisejaxof.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a17b52343ca27c987a02e0fcd949f851/pabedutilefibid.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1ff60uihlgtcf747vkmoqp8438/49967659395.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/fa8a01959f7c0f056c4d74bd327e9873/69150690481.pdf
    • http://files.ibiza-ferien.de/file/95082753925.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62740756121.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/ludav.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3134b8cf2c993c102a4f9e51c708551a/limakisogazu.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tak4isgk681em2gkule1hreqo3/tumixipisakamimekagibe.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c704faf240f6facc3cd71a8906fc76eb/53176985189.pdf
    • https://accuratesearch.com/userfiles/file/wesigup.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447f3b9f5e---21017579631.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021052507250373499.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba19f3d17d9---rufigefusogarogagipifike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=alton+brown+baked+french+toast
    • 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_off0000ef5b.bin
29461689edce6551648570a579e92d8bd8d5fd1549b10be1e588ea55b668a578
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17660 bytes
font_01_sfnt_off00011d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes
font_02_sfnt_off0001359a.bin
1cdfa80494325275d30b5239593d3fb90187341cd7e3b7c79d0efadaa0ae0f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 10780 bytes