Malicious PDF — malware analysis report

Static analysis result for SHA-256 192346a8e60c340a…

MALICIOUS

PDF

96.1 KB Created: 2021-08-18 22:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: af74266ec8a452c37299e62687e94d02 SHA-1: f18c41090d5751aa338ead7d33c5ac01e982d897 SHA-256: 192346a8e60c340ab3839de09bad7906936d3aca796bdf720089b02f08887b46
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The ML classifier strongly indicates maliciousness. The PDF contains numerous links pointing to potentially compromised websites, specifically targeting WordPress upload directories, which are often abused for hosting malicious files. These links are structured as a link farm, suggesting an attempt to distribute further malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef068978d1---75905785996.pdf In PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25248061005.pdfIn PDF document text
    • https://dineflon.com//files/vupidelubejobibav.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/69016448044.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41050c3939---32172440118.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8e2fdb9a3bac476f7bc7905d909af40f/50999639727.pdfIn PDF document text
    • https://cowik.pl/upload/japavigibuxu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/66002978585.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/17357706023.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/ropep.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/32222469223.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/12006127510.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/55408053091.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31a08c49b---78776815454.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/34230488735.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/mivudulom.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/laremumebetejodazujo.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/lexadatajekibawob.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e163d6f3c3---loxijapuvegaxiluzun.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/87222763979.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021080100313056.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hq38c950ts7tq12cqtk41op3l1/funiwifudobesozizowatij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=efecto+mariposa+3+pelicula+completa+en+espa%C3%B1ol+latino+repelisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 11100 bytes
SHA-256: 8453f233b69ef10f01672e02605aa170d3cc08b682339df8f61ef9ed8e829050
font_01_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 19144 bytes
SHA-256: 55b6f7f164ac3f00ec56de30cf9ac0d4543fefda2b45f7cc08a9bb6f5406ec69
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15894 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd