Malicious PDF — malware analysis report

Static analysis result for SHA-256 4816d68ce5e7d74e…

MALICIOUS

PDF

82.7 KB Created: 2021-06-29 14:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4432ba9821fcf22dd239fae15d721392 SHA-1: d6c5200a39929d8ac6cf1db2dfc0e78fdafd0bbb SHA-256: 4816d68ce5e7d74e5351ac87b8bb3bd0c142dbe1e24f35c6703eb7e8db527de3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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
  • 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://cructi.ru/uplcv?utm_term=zoology+book+11th+class
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b157e48a5243b38801fa088dafb0727d/mixawukodazaxim.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/lexabujivukivebovod.pdf
    • https://uleiuri.ro/userfiles/file/wodarirufarad.pdf
    • http://jrpst.pl/userfiles/file/zijozoludiz.pdf
    • http://beveragesgs.com/userfiles/file/86477154332.pdf
    • http://liebherr-tr.com/userfiles/file/kokiwakek.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/00mt5ton98tm1unqq1uh5k0jq4/zigijamexatuginomufun.pdf
    • http://washchienluoc.com/upload/file/41093868464.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088924427296---gowubodeni.pdf
    • http://modamoda.nl/uploads/pic_lib/file/55438345379.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ee4e8f29---roreba.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc29e3e5590---12726657989.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/47092443086.pdf
    • http://lycee-elm.org/userfiles/file/10741515057.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/42ad59a41debc274da37f8b94b581f5d/mazovajewaxaxex.pdf
    • http://gelikonline.ru/content/Files/remagukufe.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8acd11a2b7b24f0035db927716216c66/5163442882.pdf
    • http://cestovni-postylka.eu/userfiles/file/vipiwebezosodawi.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/20b5c811d1501569f92316388abe5ac5/38481995585.pdf
    • https://soalmatematik.com/userfiles/file/86125884990.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980fb346457---82474864804.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d877060b5db---zozebedujasosokofapivolex.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a4cabe25---45864695225.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d6a5c93a---39843996114.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_off0000e14a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 16792 bytes
font_01_sfnt_off0000f95c.bin
711ad26924f8128758fed321078296774d60135c1415b582f8e073f6e7921f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16888 bytes
font_02_sfnt_off0001256d.bin
d116d69d23e07589d52a3c46607a8adb9ac5f0e3ed4e5a6d3751ab94cb4de749
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 10440 bytes