Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02112a6715d19cf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 02:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32be60a738769127ba9303c5d26dfbf2 SHA-1: 1921731e9d49a9771619e5f5b74211b045484069 SHA-256: a02112a6715d19cf1fbba4f334088b5bcafb6b3c18c54eaf5dcc4432f9b15eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=how+to+run+2+apps+at+the+same+time+on+android PDF link annotation
    • https://fidelishospice.com/ckfinder/userfiles/files/ratojesadiwolajazim.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/51782587819.pdfIn PDF document text
    • https://techlan.pl/files/file/nukekuwepanevutim.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/lixaxixisixawuvaz.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/87382677762.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/zumid.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/98605756431.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/48893148190.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f857fa1546---16328140186.pdfIn PDF document text
    • http://methese.com/upload/files/siritevav.pdfIn PDF document text
    • http://terrietanaka.com/library/files/33862554236.pdfIn PDF document text
    • http://e-sheremet.com/img/xarexunezus.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9709f39ed---13674536365.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091005525268.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311516a9140---ninipowaxowa.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/batiboguxoferakumuzu.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/5426648789.pdfIn PDF document text
    • http://status.cz/UserFiles/File/92418127430.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/56159237936.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/gutiliduwozilovebevofabib.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zegonaxilame.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79c535f83---nuxijugexigujeburilid.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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 10908 bytes
SHA-256: ce9ba2cd34a930cc1fda10280159ae6a5dd44609176227594b01d1be3198054d
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 17420 bytes
SHA-256: 8beef02e6c7f7e944d77c4903c7f219964a1b985b8bbb60d7bddeb43508b88c9
font_02_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1