Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0057a701b93a9c7…

MALICIOUS

PDF

75.4 KB Created: 2021-08-09 07:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fe56a5685fd54c0f23c6cdf0fb5ebf7 SHA-1: e733a8f962db0fdca4e8529ab8096d460ff00b8b SHA-256: a0057a701b93a9c7ee609b057c9232f8d0cf7a79fdd500233f4ce0a0460fa015
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or link farms. The ML classifier strongly indicates malicious intent, likely to redirect the user to a phishing site or download further malware. The presence of embedded JS and external links suggests an attempt to exploit the user by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/uplcv?utm_term=secondary+math+2+module+3+answer+key+lusd PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fe08e17d0823e62064fbcaed2cb0a7f7/82038979532.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f3be46da---24522530134.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/zilubijegal.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/52268136576.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/21055584771.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/78836378521.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/revozufejerefigeduked.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/merevadagokifun.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/suremid.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/47708cbbf66db46f12a85da1f431939e/vijiwimos.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a3e54e103e639bbc7de65ac907325d41/susudenivobomi.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/64397500606.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/46509572605.pdfIn PDF document text
    • http://haai.org/upload/file/26840794835.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/29765408224.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dc14a154---1288653980.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/v5a0jom4ro6mdc5pveguvn1j92/50699161434.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/jgihdadiplukkl23chm8ptj4g1/71031625365.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a950a12f066---suteputexaf.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ed246697172921beff01a6e98befdcf1/92765411024.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_off0000c1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D1 11300 bytes
SHA-256: eacd93ab3ec5b3d48cb1be3a2f27172efc8d12aa9812ea990e6ad3de8f21b915
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 16220 bytes
SHA-256: bd8a7a053543c30adf502ff23de044087e8d183202bb2135314034149c79cbdf