Malicious PDF — malware analysis report

Static analysis result for SHA-256 9529bd6b299c9ba1…

MALICIOUS

PDF

87.2 KB Created: 2021-10-09 07:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 47bc96b6ebf3a72bc6bb70054e38b5db SHA-1: 2e29666c05ad23ddcbef7ebb55269752abc84004 SHA-256: 9529bd6b299c9ba188ac80361c3b5cbc0ed592a93f501218c2d3f13408801e2c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pistant.ru/uplcv?utm_term=funding+your+ministry+pdf PDF link annotation
    • https://sonntag-immobilien.lu/userfiles/files/59227935208.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/fidijam.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/sazivoxusepibidokexirodi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feeed9f36d8cfff5ad7220d2423793fe/99042912388.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/94270684850.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/28832953343.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615a26d890491---49617684982.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/1357750525.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161537f55d2dc9---90769765352.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/78842413250.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/24516919012.pdfIn PDF document text
    • https://forssah.co/userfiles/file/11109450442.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f94b7402e---zabafikomuja.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1be62ffd859ba027a1dec7ba9d0ca6ce/kebajikilil.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/74636447026.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/44459904548.pdfIn PDF document text
    • http://sb555.com/photo/file/41794241116.pdfIn PDF document text
    • https://suncables.co/images/file/94546372404.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wibokobaruwuwobewikagav.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/56016080803.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/kuduzax.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/30652892481.pdfIn PDF document text
    • https://olterus.org/contents/files/79943794882.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/74336938920.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/21263352339.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210912211230396.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/99970390769.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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10692 bytes
SHA-256: b26d18768e592fe3695885b37776b9ec595e606bbb4aecc89c5b171d48528a44
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 19188 bytes
SHA-256: 5694587e97e85577528ceb879784c4d321223c98265bc9d9bc96ea8a37375955
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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