Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4312fbc7021f03…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 10:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53652ab915090e28578508538c8c69c1 SHA-1: d9d87eeb7e6c1fc7ad3a72bbab72a4b13a009a6f SHA-256: cc4312fbc7021f03171f59cdca2709f19580c91c9efde6be751726fe2b3d44d7
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 numerous compromised websites, likely intended to lure users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting supports this assessment. No scripts were extracted, limiting the ability to determine specific execution methods beyond the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97b9b74bb---begupol.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844470e033---23266348811.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/jizubupurojujilul.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/pazafufojewukuboremim.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/dapiwelobawapavo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aa37e5d92---44350475753.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/93449386091.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/72b08c5e84b4510d6fc7d1b3f444be72/8672541131.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/desinimubozoto.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/11lo7e7b86gp3irdrlvoce5s0v/53947803639.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20325d65b6---82389077042.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t7ae895g1iki61had33ta1bdk0/zonefubixewa.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/vipixopizaradipafiluxido.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/4584490062.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6e78fc137dacbb74b6b9a946bd2a8e4f/bezuvimadure.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/kopedofoxapuvuwugo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4c1977a24ba96864f9dcde16d6472e3/3899486432.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4debd0c4db---6315019886.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/16576de3f38e12eeaf26baaa74e1c975/diwunalanazirimoruwazi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65d463061---xediremojuru.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2789001793d2052b8a37f43b16bf060d/11284463685.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0f5cc59e2c19bef92ee6e3a5249bade1/xoreluvakufidiwawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=easy+lobster+thermidorPDF 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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10648 bytes
SHA-256: 8bbeccbd8110069938dcf40324f5c35c082e49d9f7d40c09ea0195453fd00f28
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 16540 bytes
SHA-256: d8d3a5de2c203c99d9dddf99e15920d18806df25d07c4f5c40cb012c1b02d203