Malicious PDF — malware analysis report

Static analysis result for SHA-256 7427d88de5ae1e0f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 10:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49f7df0d210f2fc427f78051d1fcd0f5 SHA-1: bc555cd30c147058f011fc2b44318329593c9d1d SHA-256: 7427d88de5ae1e0f3c9c4dd7143f15c84905a08dfe75f121b4a431e6cc7196cf
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 phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=quimica+general+whitten+gailey+pdf PDF link annotation
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kcdrri1q3b4ffgcjg25tb5t3k7/43963243643.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wipilikesawemosonikuve.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/fedijuz.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/30422509020.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ab474dd33---kuvivixadakozurixedov.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d15d57c1d53970a7c12012f72c5311c5/jomarepumidala.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9c34edf0---wirir.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zusubajopetu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ec8d019c3f89dce11caa84080909333e/dujewugozupajasex.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/kofufap.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/16205258643.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/musudizewudofaxito.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/88745755023.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9a78239a---zasagolumaxupesesomijava.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/wujejeroriw.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/95836403651.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1d3921c2be8492817bd45c43173e4afa/telebofaj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b24c69d47425b72da5ed07dd6e275b26/lupobetukenux.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/1301978497.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tefonazinilixafifamamit.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c626c03f44f18daca40a97bee8de3051/tiziluwobobonesuwo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e439ab6563f---69925871994.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094371e3284e---8701486517.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bmp5upq499bum2pbk2d52nb0l3/panupepufapuliwixaxi.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_off0000b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81F 11140 bytes
SHA-256: 204bff7ed72ff5776dfd45dfae0d72a0428e20ff2cd33cc0d7f70270787e10bd
font_01_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 17064 bytes
SHA-256: 413ed7e174d58bb385185379175612d7554cd88788b4fc88cf788556963d4b65