Malicious PDF — malware analysis report

Static analysis result for SHA-256 94844beb3d006d4e…

MALICIOUS

PDF

106.3 KB Created: 2021-06-30 15:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7d7329a5d2d661abd179c48d8ccc07d SHA-1: 4cc5fbf4a0fa2b91d62cae9560d015f357b8f54a SHA-256: 94844beb3d006d4e0d9fbc098118c40220a1d7c4ebf75b2e35a4eb784261bbe8
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 WordPress sites 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 0.9863

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://ibtaker.ps/userfiles/file/digonik.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608645b7bb4e8---pimetatolimitixulitatijuj.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/7ml8qirbdt1do90bt0l5ahcrv0/68667204245.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jbenecfp29k9g6jqnre1fcbrbn/jafodalowurujela.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a89b0d82---vifobeperivapenif.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/xuxudelutonem.pdf
    • https://hirurgija.me//files/solodonokawo.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/22727236274.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1358fb87d8---10739294554.pdf
    • http://brenno-tojestto.pl/userfiles/file/bapeninodipidafeveduvat.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb20a487a---sepafafat.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9173524dfec80515a129e7a1a5c7da4b/bokiwebikaduwavuwufi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c080f2d734b---rapasiwiwora.pdf
    • http://sujitonweb.com/userfiles/files/wosazanu.pdf
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/48058871509.pdf
    • http://vdtonline.vn/static/uploads/editor/files/budumojafexolojetipad.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ba5c44a53d89f28915c70b4330d73b3c/24884350186.pdf
    • https://mn-lawfirm.com/box/userfiles/file/riwijigorife.pdf
    • https://dailyhondaotomientay.com/upload/files/sejikajifemezexofuloziri.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/52790960076.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b38f1dc9a9f552cd4bffa48e81f1a518/filot.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a96cd7cbbe2---kodurobebizuvepapu.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b91d19e8---36949691054.pdf
    • http://to-kajihan.net/js/upload/files/bafurezizibu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=journalize+the+following+transactions+examples
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/975a766f4dd0300e9ffabb3ecbf65e92/tetekidupavijuki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012414.bin
629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de
pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 16084 bytes
font_01_sfnt_off0001394a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 16792 bytes
font_02_sfnt_off00015161.bin
21578a97a689e0c14e411629872e4c024e9103e0465a637653974e8bd8556bbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x15161 11268 bytes
font_03_sfnt_off00016bc7.bin
98bcace4fe5e1a5f5673036b4037546e0b0b3de7ccc9d68fabfd1c567d401b96
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC7 17404 bytes