Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5e1ca6c6cc4bbc…

MALICIOUS

PDF

74.0 KB Created: 2021-06-21 19:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7ed64c8fb9e3226be7d9f3120eb30957 SHA-1: 62e8f0baa62419e19bc4526647b7bfe9b2b3310f SHA-256: bc5e1ca6c6cc4bbcb3b12d23e68850948773078e6be24c934054ff59f6078fdc
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to obscure the true destination of the links. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5e50e06c---zaditub.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/608mro2csvsren3fasu9mu5vdj/fafedelefalunib.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a25a1891---35590472822.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/25337073418.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/firivijikipolavi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/67e515010b9d442a95f717a053a11cf5/38969134695.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aea47e3d735---79169123935.pdfIn PDF document text
    • http://sparkpro.lv/content/file/43735160298.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mt4qk6b2qtru5qig18h5i1f7gd/12470307506.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kaleratuka.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416a39cb3a---pesidujoxisa.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/urn4l0qlfumarus5t918hhi62v/34623494229.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c5fafd09---kenemiluzezuwuzavek.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5be47b679---26250728984.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/pofifotuzinijenake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=zelda+botw+theme+pianoPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 5116 bytes
SHA-256: d767f40e3c19c9348f4bc1717458e416eb80cc0e752cb95a10f38caddff6b1df
font_01_sfnt_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 4132 bytes
SHA-256: 6594c258bd3d7b8d0fc774cf22a3883fcc272004cab3cfd37c0a00e48365bcc0
font_02_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 10816 bytes
SHA-256: 278fe447467b79d8173318bbb5ff633ad08d6ea16ba7b717de06c8b70bf663c6
font_03_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 16192 bytes
SHA-256: da2dbce518af5e79b49817e8e96bf9b3ad92f2ff06b3adc3a3c9850ef5b8511c