Malicious PDF — malware analysis report

Static analysis result for SHA-256 467a74ec91d224cb…

MALICIOUS

PDF

73.3 KB Created: 2021-08-29 17:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ac9a73305b8b823d29014c70d473194 SHA-1: 86374b556b96fff258ac3c5d536147dfc4eb7c19 SHA-256: 467a74ec91d224cb73ca3fc613c436fcceacb73ffc2dd04f5efc7f688e793ab1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. These links are structured as a link farm, suggesting an attempt to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://chcial.ru/uplcv?utm_term=cationic+surface+active+agent PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/efef074c3aafbf01e778ed507cd15662/672501708.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/66991274083.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/gexeselowilede.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/fasulujubuvitamotuv.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/157vuv14mv53bqmpikqbnpbcj0/laratuferarotozobilemi.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/levujimumitibavekulavizag.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ade04c67baf122be6b52de8c58662c1e/14509137333.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/16840896047.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f99306052be0a53bf6717a02aed4530e/90858822887.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43989a33c910f98fcbda2ac4566f0b93/gitumugifevas.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/19509121210.pdfIn PDF document text
    • https://emprenderem.cl/files/70991185166.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/befiwafiteluzadoliruwodo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/73870375667.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/86699e08da859bff68cf0d4fa770dcc1/97262858462.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/vijezijadolumibuvufato.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/babikibuwovanifozojavataw.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/16773192546.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/52794592555.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795a0d1ccca---riwozizinivubajevem.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/zigerozaxalevujejijakitag.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8f2jidp9776aui8l1unp704hjr/83406630670.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/60027851554.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/5259082734.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/84541558410.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46050791614.pdfIn PDF document text
    • 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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 10664 bytes
SHA-256: 93a144c60ddeb6e1dbe39090cca51eaf220c700e78fab969f27c4a69beb57797
font_01_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 15404 bytes
SHA-256: 5b93cf2fcb5be11088a4fc8f8b4b000905490e955b5675a9f5d10e749449126a
font_02_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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