Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1dee80b94a4528…

MALICIOUS

PDF

96.8 KB Created: 2021-08-13 01:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fec3cd0734ecc89b56ba8c0856769e05 SHA-1: 06fd61d5d5767c4d0f0a2300a65513fd15bb537f SHA-256: aa1dee80b94a45283b3260ca6c1553d3d6e150d8de511e05d0b0d86048b163cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://ketchas.ru/uplcv?utm_term=how+to+make+a+frequency+table+with+5+classes PDF link annotation
    • http://extracam.es/app/webroot/arxius/file/guwasisinuroxebo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wikiweruzepok.pdfIn PDF document text
    • https://menu2uplus.com/images/file/80673524364.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c965dbd07a18802da6128ec1e7c2ac0d/92239020449.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ee5f60fb00a6652c8040e00133956778/64790972514.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/01/22131574597.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ppqom1noae7mtr08fikbjq7et0/13458404782.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081db436964f---48472425293.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0bf23b5c6---21635728670.pdfIn PDF document text
    • https://energooptima.hu/upload/File/90579065616.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/5134106375.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0573de7b3b1cc29e5d953fa65a61de2f/tubunokawog.pdfIn PDF document text
    • https://tavio.ru/files/file/67466857407.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sf2sfdvu4hvb2qh7cird7uvogt/88000955487.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/gujoditeta.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/53919956533.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jiwawuz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/55974fae0fbe66b6c6d71cec7e959bdd/pazewip.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/35540704689.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/xivisuwozitope.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980ef54d17c---58166035874.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/96869112945.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6fa9f527ad3064087f1d19037845d61c/xudikojerikujatoven.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58316335582.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/vuvus.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ad11145a2ab2944282beda98f49995fb/48217090069.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_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 11404 bytes
SHA-256: 882dd3f02ec6fa634204b2e6e97f693a06916d128affa0f88d7a80f24a8ba808
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 17824 bytes
SHA-256: a63d3f5b3d0e4223d90b73ced832c133f7f783c33f69a95dc0c701809c07584f
font_02_sfnt_off00015bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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