Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aea9359475eaff…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 23:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 259339728c7bf845c3f6181c24d8d12c SHA-1: 49302c2e8078c480c8579fe6c2a4570579624a91 SHA-256: d3aea9359475eaff4a8a0bfd2cd7a8e72d0686588ef84028d0e5b18f02ec4336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=android+list+services PDF link annotation
    • https://sportyou.fr/ckfinder/userfiles/files/50407867212.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/35834110979.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912151829.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44246813680.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/12086633693.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/venekabumi.pdfIn PDF document text
    • http://charontrade.hu/data/file/65793490735.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd443004c---zawubuluxeme.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613026153c08f---1213324017.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/78723770735.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ce4bbbe57556e09b84ca560d5ff725ea/notifosawovu.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/kudovudogalaxa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/72791648477.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/98320474632.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/23414713694.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mobaduluxozopudizedogo.pdfIn PDF document text
    • https://ckmandarin.com/uploads/kudiradawelavekedipa.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/sezovovuset.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/gesaxefazizoladutabun.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/ragalarisokiliji.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/07/kuveranulinipevitiridije.pdfIn PDF document text
    • http://rentaruedas.com/files/others/tabavowexap.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/38294df5c4bffad94b141e883b1e3b09/jugikajevuwuw.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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 10248 bytes
SHA-256: acd8e7887aa77a36799b313ddca3494dc74510db7c13906184d74947fe2e8af7
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 17848 bytes
SHA-256: b1be4e9d247f0bac3a23f263b5b43c0796ba72d1709c85c07281ecbf44262001
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1