Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ade16cbd0b261d3…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 06:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be754490fde0bc6ad8c60450b7777f39 SHA-1: 0932d2cd827fc739d158b3f580fd72a820464cd0 SHA-256: 3ade16cbd0b261d3deb0132152585b37ffc6c0f3612fadd0d66ed7523ca0dc37
104 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely executes malicious code, and the link farm strategy is a common technique for distributing further stages or phishing content. The primary attack vector appears to be a spearphishing attachment leading to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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://allytemp.ru/uplcv?utm_term=exercicios+fisica+enem+pdf PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f1b3b1bc---23340201868.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/864ghuuilv9tf5o9efg8b49h8u/36261277057.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/koj0t8dh17u3lp4qef06ocpdv3/subarolobi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/44a78fb4469a77a2a41143b051bf8321/53736788001.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/84900241746.pdfIn PDF document text
    • http://giustofiori.it/file/vokajogosu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5frlphl7t1poaq0qqm35kfjve0/33358195334.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf49daf86---zabiledige.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/juvuledofugijanonejif.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/70624135464.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/377683176d8ae3656b96c300696e65ca/90715191501.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/82368427333.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/53570561198.pdfIn PDF document text
    • https://digireg.nu/upload/tixebolo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bae1c15c4---soviwozuxuwolukodeparanun.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/guvagufomuziz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b1cb37237---najir.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/09de94fada6671956da2f0b9561a15d0/palesu.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210728_40DA46FD0ADCA658.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/gosidi.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/78119421065.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 21100 bytes
SHA-256: 0195a6b48f5b45f4fc860e2aea37bd0c8f1587a5bdd3277f221040de58eef9a5
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 10724 bytes
SHA-256: 7795165f8f5cec2a8f683638b4324db0dba114c6ee39b00cd25a313f35818b73

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