Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97a56f299a4e60f…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 01:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f2d826ed6d90f05921d6914c5f9a6bb SHA-1: 74c92c2d96f1faa755f4fa239e5d9d1bd42f48a2 SHA-256: d97a56f299a4e60f2a41dcc3e3bb2c957e0fab6bf6e8afdb642ad6a29e22d309
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://recviem.ru/img/upload/bulojuxevaribajifavekujo.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160853a1e2e57f---25744613901.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/vatigobugida.pdf
    • https://secolink.sk/userfiles/file/7656117544.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/voruzedikurinuniki.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/78ed3883bf469f22e121b19dec48631a/sikojuxarejibifuposudodu.pdf
    • http://multi-accueil.fr/ressource/site-image/files/lugimixofesevonivuwet.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160905974d392d---devujezozisuvoveb.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/54006256944.pdf
    • http://brmhn.com/userfiles/file/20210515062056_2dl056.pdf
    • http://bagliodeimille.it/userfiles/files/34638388906.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8e5b0j0ims215ev0vg112q6eg2/fozabevinapilafikewo.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fd67c22fed2bf1aa1e1c763b78244bf/34523813980.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/519f9e6e86ba7d467e209c9b0cde0da9/41259170879.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160776350465cd---29930926896.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c139e9d1---febunovokiparufodid.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4ddn9ub965mu78dtn7jr2681e0/gumoda.pdf
    • https://aslimitada.com/userfiles/file/61684430209.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ce64de5b---38459082944.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/65e8eaa9c702cb19315b11caa5840475/83107355424.pdf
    • https://cplastik.cz/data/cms/file/83384682903.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9516f18be0---87214446893.pdf
    • https://bevelec.com/bevelec/dossierMois/file/fiwafisa.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f793aa8cc---jugilebaravowawalo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=old+point+comfort+lighthouse
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97b.bin
d04097678eb5b49d9793879a7278c10593684c602e49f1639b126df0fca978a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 17712 bytes
font_01_sfnt_off0001181a.bin
45d4ce8b05b6f1ac8d32bd34811d55d3ec8392a317dd98b5d28fa89323603d69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 11028 bytes
font_02_sfnt_off00013157.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes