Malicious PDF — malware analysis report

Static analysis result for SHA-256 846520d3d473986a…

MALICIOUS

PDF

181.0 KB Created: 2021-06-25 20:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07940c6684379dd3a53e7fe5efd049d0 SHA-1: 75a409f0213359daffdb6a96c84a043cdc77b08f SHA-256: 846520d3d473986ab6dd58d9c989c7a456e7205120b988ef8f5a31b925c063e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9148

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 https://alakharia.com/public_html/userfiles/file/wefixixumixawawuvuwekamo.pdf
    • http://cottoneauto.it/userfiles/files/lutetalo.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c137eaab6---tolulexutezewemuxu.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/1636545005.pdf
    • http://botosani.ro/img/uploads/file/86061910010.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b2e853269d6ecc79b3db90d8ab4e1048/gaminajefutexedo.pdf
    • http://ladyqueen.it/userfiles/files/37851771845.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403f04cf6d---fipozojodurexa.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3vvpsjk426oqf5da2ie0k06h8u/71673956501.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/93388c59070f57c2a8655b6df60c77b3/wuzanowa.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/42696620897.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/57808303544.pdf
    • https://isabellepieman.com/userfiles/file/jirowojonobapum.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609538d0d8a27---patenek.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160714da92b8e2---botudori.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c4d2a4f78ac89e11f9033a80ffd3682a/bakafaxesapogo.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/97209059858.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3a778d57---13901877714.pdf
    • https://cbconsulting112.ca/userfiles/files/13254663665.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4df909154---23971517787.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/84150588974.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11091135186093d0fbec082.pdf
    • http://alpinedelhi.com/userfiles/files/tuveli.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d9dc31599650eec19c7a4fb7e2042b1/ronizuwanimakuxajosafip.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6253170a033b3af146c95692751d8840/75238587365.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe2a79e46---vuzavoduwegawodudumosew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=feast+of+epiphany+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000232b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x232B3 16792 bytes
font_01_sfnt_off00024aca.bin
bbd09b895e4c0d031a07bd060c4fff16985ee8730a23efe921adbf74c7cabad5
pdf-font-stream PDF embedded font (sfnt) at offset 0x24ACA 10752 bytes
font_02_sfnt_off0002635d.bin
4ea2430dec9d89b5c10db46c80b01ac89c6fd73b9a4fc9a8e5980b8aa1b49cf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x2635D 28504 bytes
font_03_sfnt_off0002a70f.bin
2232d3da4d6c866bd681ee394519529906f9f84f75f11803e7ee491bb681cb26
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A70F 18804 bytes