Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76fd6a1b9f3ec7c…

MALICIOUS

PDF

96.1 KB Created: 2021-09-03 07:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3115791aa6f9b483ab6a23b04b3cdc07 SHA-1: 4d266181ff74a45dc1cd10faf0bb64db8cd28dc3 SHA-256: e76fd6a1b9f3ec7ca109fba019b319b38493a8ea87fa94f200df54258627b1e8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a high number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The presence of a 'download button' lure further suggests an attempt to trick the user into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://halmar.info/userfiles/file/naxosimufimuwibe.pdf In PDF document text
    • http://zs-oilfieldequip.ru/d/files/22695190451.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/nemaputa.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c292dbd0e---gixuresopaxema.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e5706c52---12839783891.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210826130131.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160906f5648968---severemaxopevopomaven.pdfIn PDF document text
    • http://houselandia.ru/files/63130100604.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47032727312.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49312751557.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9e13344f0558da9a629c2807b79baaf4/levukuwototulivuvetuge.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/setabezimokerivujudaxoxak.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dutugadorazeboxu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/17fe128d3602ed26225c9dbf5fe9f734/1031727162.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pupad.pdfIn PDF document text
    • https://rajakedua.com/contents//files/xatuzizonal.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2f3643a18---82787310993.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7f9b2ecb---29597609014.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/lonog.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd04c6f6ba---87395596297.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b91e5ed9ffef3a860e9665b800fa4b6/feviwidagefefepelujapameg.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/86324109572.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/kewalipokejigokoru.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/38096174492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=edexcel+a2+chemistry+student+book+answers+pdfPDF 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_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 20508 bytes
SHA-256: 84e60f1a45afee4ae2c06ed6ebab58bc4308204c584878195d3f7428293c04ae
font_02_sfnt_off0001573d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573D 11620 bytes
SHA-256: 7d37bc51266eb276cd76e98c7b4e41aa86848a612d210c640bcd2c20dca083d3

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