Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a05ab2887181df…

MALICIOUS

PDF

91.0 KB Created: 2021-08-13 15:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec737d3e2016f4a98b2f49d0ffdb5c06 SHA-1: 3bca99cfa02e825cbb160cc447a121ca1ec9d76e SHA-256: c1a05ab2887181df886d5f690388ff86fcf2a3360aa3912e6a0b2d257046ddf8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the primary intent is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://longarmquiltacademy.net/fckeditor/userfiles/file/72511966472.pdf In PDF document text
    • http://cmtoolsrental.com/user_img/files/86152035196.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wibuxof.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/99321952914.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e5e0f47e51572ce07f4bbb34ffddff55/raxanefovakiwaj.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0bc306b---dutibedonijobetozaw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/14bd9e104fdbfa1f77b8dd66b901fe95/kiborup.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/902593b03f9d2ac2c5d18200c7fe97a3/sobifumavuzin.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d796848385---75784332040.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/49636812102.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/22450421523.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/44715144378.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/82205359591.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k5ft123493u2kdg9san1vjg02e/24127904699.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lakitepoxamadakoregu.pdfIn PDF document text
    • https://digiconelectronics.com/media/23326260585.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/38250708023.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2f858836ea1d7b7a4da12d629756ad7d/93817187908.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/75975365289.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a837cb943a1---gunimasalotofe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kugejadekenanelipidu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/60426423555.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/74918726656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=disney+abc+coloring+pages+pdfPDF 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_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 10952 bytes
SHA-256: 887900512b8f676c41d169170fbb1de5c86dcded6ce791b940b9364fcce07e60
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 17388 bytes
SHA-256: 1a823e0eccab3dc5be4d07e9f374370b95c28ef333f53e55c38a57c3d7eb495c