Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16dd86652dbc8ea…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 23:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ac8eae866d991f18865ac90fff7f0db SHA-1: 3d1dd8e73a2f64ee2948a1a2bd28ecf7ecf39393 SHA-256: d16dd86652dbc8ea918367b5b48617d22d208e199ba3d5db89839e9db0ecc5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=catalogo+schuco+pvc+pdf PDF link annotation
    • http://cesishotel.lv/res/wysiwyg/file/nokipumojuxexojisaven.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aeccda7b5c4c4bda6dbe439591dd2f40/13582082466.pdfIn PDF document text
    • http://cichanski.com/Upload/file/57555485545.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210618010039.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2091ae4dae4868c5a92549137adccc5a/21779694832.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/sf01fja5ndon6q7hgq0r3k326k/43062474842.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109022034045134.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dnl7nrmpltmbe1tgptqdfc1378/jusukexikakene.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210719/file/1626649285.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/86ae4b387b9a0e67e6a7030bc499fa96/dajejumedoko.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/pamazoremubapuseruvom.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97151021c0---muvenerokaroxizaje.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/radalofosokebosewija.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/jojonitofi.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/14740333107.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kafiliritidef.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8032d250---86710808243.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/rowexupe.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3a70g5k34pfts0g74goa1tqf33/tikopoboziz.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/balanil.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92590977575.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb7a282b5---zuvesawabemuwirej.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/96380610503.pdfIn PDF document text
    • 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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 18288 bytes
SHA-256: 78d55a9e604b13a7ec5a797ec55553b3d60fe63364f36267658c26de351282d7
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 10668 bytes
SHA-256: a2afa52db2a5a64bb518e60c464362206e6df9126c26cc80753a79b6c67c8da8

Open this report in the interactive analyzer, or submit your own file for analysis.