Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dbabef9e0789cd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d43ac6cdedf0d552c2f6569fe2ca0f5 SHA-1: 028bd9f91e92e3d3058b709a02c83a7c365dcc03 SHA-256: 52dbabef9e0789cd8da3edad6cd2ece73a4b63cd5cb28e54c1f7390c100a2de6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://crysiq.ru/uplcv?utm_term=how+to+save+mail+in+pdf+format PDF link annotation
    • http://nhakhoauytinhaiphong.com/upload/files/45924234174.pdfIn PDF document text
    • https://penal-garazh.ru/files/89402262991.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/nozijora.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/fanewenigonadetatur.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348cca21c88---jabakugixapito.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340cabc5037---rerifaniridolelowufa.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/kafunubamimavolu.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/vifufunokebuxe.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/kimalat.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/fufokuwovejuvefadomutol.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109101449481748.pdfIn PDF document text
    • http://lecostationery.com/files/file/vosamikorojowinepobosesa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a4ec6698---48794511911.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/mowojulatomuragi.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/lulebosokowiduralawiwa.pdfIn PDF document text
    • http://heizler.hu/files/file/galimezitebekogokanigel.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/88785337595.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gedunexidetafowel.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/xakimizaxiso.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/4053051456.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec4c5ccd0---67955373505.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/jefikibivodemifotaj.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210916074824828.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/zovalaf.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/2977563293.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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 17332 bytes
SHA-256: 29541e82344f9631f4046038e86f694a70027f316765a9da0e2bab3606c85c40
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 10804 bytes
SHA-256: 1d6a1e647ec1508725407d418027c9b042013aca9ecf475e82e0602b3f5ce498

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