Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff978056c952a94…

MALICIOUS

PDF

71.9 KB Created: 2021-10-02 14:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfcfc74e8f572da85ad08483ed73ec19 SHA-1: 3c5f77b2d02116e378da3579e1f316147bbed9f6 SHA-256: 8ff978056c952a94ccb72ef56fbd280bc78a06db6e3a4402b8281d01d6554d18
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://fazendasaojudastadeu.net/fotosempresa/files/polenirisalibugafo.pdf
    • http://tecsun-moscow.ru/docs/file/77505066253.pdf
    • https://ksi-system.pl/editorfiles/file/wavinome.pdf
    • http://yansyuan.com/UserFiles/images/files/zojuwogajakedopirubafexoz.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161467eca037d7---gajetasojiwomimenizogu.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152e85238307---34739502077.pdf
    • http://doremimarlikinsaat.com/userfiles/file/74765598170.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d8d988064d711d4c067deca8602155c3/64501623528.pdf
    • http://g-shocktou.com/user_file/file/55262557515.pdf
    • https://ocw.tw/uploads/files/tebakilanizafiduseg.pdf
    • http://bjjiffy.com/upload/7676734863.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe13bc67a---28483733532.pdf
    • http://wedooverseas.com/userfiles/file/wubiledulaw.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/27835435654.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4004b9daf---wokudezagidifebafidusip.pdf
    • https://testgit.begurholidays.com/uploads/userfiles/files/panaregowebe.pdf
    • http://tottazo.com/userfiles/file/33774434735.pdf
    • http://bpabv.nl/uploadfiles/file/3718590278.pdf
    • http://spamsmsgiare.com/media/ftp/file/xuwoxaxupugux.pdf
    • http://dulichtantai.com/files/uploaded/files/zipawedudovixedejisuvas.pdf
    • http://nawoo.net/userData/board/file/41554489989.pdf
    • https://needlugs.com/userfiles/files/52003525035.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xudabaduvomadawasotitan.pdf
    • http://daieimotors.com/js/upload/files/35830844111.pdf
    • http://tuvanluatdanang.com/upload/ck/files/pasidafutu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=find+the+value+of+the+constant+k+that+makes+the+function+continuous+calculator
    • 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_off0000b27c.bin
ef61900c7f0bb9cdb1f74b2fdff1955444d0c80862a4b28cb2932eb1febc5462
pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 10976 bytes
font_01_sfnt_off0000cbbc.bin
ba54be0738c69416aaf156ab04cfdc0a481d245f8a2222b9f3a6e16ca99ed0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 17516 bytes
font_02_sfnt_off0000f94c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16792 bytes