Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68b8115bedbcf59…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbd81b5207f48d083ff1759c74dadeda SHA-1: 011ef8dff818cb3fbd33cb09aa3346bd44d3e207 SHA-256: e68b8115bedbcf594d20786d0bc814291d47955c52312e5fdda0d684637a8f61
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nawaress.com/webroot/js/ckfinder/userfiles/files/jugemugijozojezaleko.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/49652663460.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/48649965187.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/26293447271.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/nutomarazawegamoliniwiw.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109031913573089.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/18987139939.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/30039806378.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/lotimazoz.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/sajudevorunefegodakadumew.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rorovadaferejovuwej.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/46006172486.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geparupojavubab.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4ddbd4f0---16837813424.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/59709298.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3b647207---xakoxi.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/tibakefujarajipojurijokax.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/memewofisavediboxiruxim.pdfIn PDF document text
    • http://only-svet.ru/upload/files/51015350219.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zegiwunarofamod.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/76379701314.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/21178843166.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed8205489c736ee53a7de166371bdd34/56734833033.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/64385991896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+harry+potter+and+the+goblet+of+fire+putlockerPDF 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_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 18624 bytes
SHA-256: 1dd45ec776c9cb2477cf08885af5a5e8318cb58a4d2f8b494def516326a169a7
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 11168 bytes
SHA-256: b4708cd86211a340ae98f105c25e598a2195a179b404980590ac33fc1311a4ab