Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72d4a515b48ab81…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 02:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8386645160059b7de54c9f9874f3eb01 SHA-1: 07e5932ea27433c7fe2348eb8cbc756d2350c18e SHA-256: a72d4a515b48ab81628503be48f45a6e18a2a40738331e29ec54b4d938f100a4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alirezamirmohammadi.com/images/upload/files/vetexumumejironufivib.pdf In PDF document text
    • http://cedule-plachty.cz/files/file/dipebifevagesope.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/dalevaginikonamak.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342cadb206d---tubujodojirim.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/26252492995.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/51667873696.pdfIn PDF document text
    • https://maturana.cl/upload/file/xopuzi.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/55750805284.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofivofijomazuwu.pdfIn PDF document text
    • http://interconformity.ro/images/file/jixogitavun.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/dalevezelukobabefukajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9baa4d848---43811911926.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/domuroxumoveganuvifolevus.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210911_100900.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/xororajanosupe.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/31964369029.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tikifaroma.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/powijusijuxidukat.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/42475073603.pdfIn PDF document text
    • https://renteci.com/imagens/file/radutibumerido.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/61953507299.pdfIn PDF document text
    • https://almavilag.hu/files/files/80448724627.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/rutapelupibamidir.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b26b79215a---59809593045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=boruto+episode+204+watchPDF 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://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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 11020 bytes
SHA-256: c282b07ee36e0902f131c7f1df9e7ffb2a070e4a6d3903a82a50dd81b8bc8c4a
font_02_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 21128 bytes
SHA-256: 667b385bd8c805dc8656c2f2f34c18c4be1ec00cd579701b69f6b5416bb758db