Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b761bc6b18913f…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 00:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bdda58fc90e84cde82425cc26e9c7545 SHA-1: 427db96aefdeeb9f4aea8ae96cfd7d0ea9c017c2 SHA-256: c0b761bc6b18913ff383800309593762024793d51dddfc8749af17647b67570a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. 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 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://pixomot.ru/uplcv?utm_term=neoragex+all+roms PDF link annotation
    • https://alarrabnews.com/images/content/content/file/jefonafanowisopajipikudud.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/55575944675.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/ponor.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143783a97b64---60168171374.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/jenisa.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/91373359951.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/79966321242.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/vosibakof.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/baxamopotubepopoxisub.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/70049118659.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210913_E5C910F560F1E81A.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/89253919766.pdfIn PDF document text
    • http://platcometals.com/images/file/13539958237.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/terefusesutugefimukarox.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/tujerurilosawizetaba.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a60b3ce3411aa162f2a4f2230112ac1/29331858188.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/volugudexutafotuwi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1863583d---vanalanufejemugok.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/14144798253.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/52360715503.pdfIn PDF document text
    • https://riwg.in/userfiles/file/sapoturinaxuwelexajobo.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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 10236 bytes
SHA-256: 64c087d64171792b820e2b19fd4fe9b44ad96b8d0b3515ae6afc4881fe7ab8f6
font_02_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 18600 bytes
SHA-256: abf7e62a0f8228608b3162068a0400bb8e86f046b67810fa305ae7b74dfe172c