Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c50c86cb9c2ffa…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 05:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce7bcec343835e57871ff1fd080aff67 SHA-1: 7afe7fd5595d1e39052abb41d9037fe08e15c0eb SHA-256: 64c50c86cb9c2ffa4d555a0c448dee431752850faccc82f59327cc0ee4b71445
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=principles+of+law+of+evidence+pdf PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985212ddf05---nisowowizidotof.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/74374963872.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/13481047170.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/bipufixivowikebujekadak.pdfIn PDF document text
    • https://norservis.com/files/files/senato.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/kurafewuwizedofagekamon.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/71550957876.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070602513079.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf8d5598f---55003868777.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/rixunirufovetow.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8c2339e0b444eab92fe4f749df1ff165/88510796111.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kj6p5gvdkqv33cj1apfs30vk65/49625600103.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/kulafosuwizif.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/barigadegipefipizaz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f545bfbc09f09f74f836547b0ab8139e/fibugel.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/36371890584.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/tojisijuxeladefinodu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/65a2c398c6b779ea030bf80c1bb7c1d4/fibejedafe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4v3dg3na23gp1vdfvoh7bc2tl4/jemuligijit.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9db536209f07d04bce961b60a8d990ad/2796658633.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/pejobanebusufufovowav.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_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 10668 bytes
SHA-256: e9c87e63c071fdc482dd8df74ad3fbbbb49bf2ade3a1d9af0e4d13e1dade406d
font_01_sfnt_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16896 bytes
SHA-256: 43a019c58e0ae6ea67d8008499d5251844b2be5abd34907fae0637c769c96dc4

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