Malicious PDF — malware analysis report

Static analysis result for SHA-256 19037a9abf71ed0e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 15:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4743cd2eddcebd192b93515a4c41b71c SHA-1: c41d88121c36fe9640500001a7c5e7d26bafc34d SHA-256: 19037a9abf71ed0e8d1ed0ee9bd1467989b18c103457c789d5a375ef74111643
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users to external, potentially compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310417d00b7---31308235478.pdf In PDF document text
    • http://leebyunghun.kr/new/upload/board/files/goluredunip.pdfIn PDF document text
    • https://tekmaker.com/upload/files/wokisamitarirubigodamepi.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/bifugu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed232511d---rufidolajagufofu.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/83644316923.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/38813988998.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/89817947990.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/lizisemesozufad.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/deresutebugekazoxade.pdfIn PDF document text
    • http://progetec.org/userfiles/files/81556030937.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/55082306333.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/gozelebakikosexi.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/bikukuxuseg.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/95411268838.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/jedolodas.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908113656830775.pdfIn PDF document text
    • http://cbstav.cz/file/89841261981.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e28d16b1d209bbe81836e5bc30a35033/60222973733.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/kapokufabobokidi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jt187ht6rrqfaukpsa4eb9kh95/77894617243.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/pefenaxivaguweli.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/gunomufusuvol.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/12064453092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=c%C3%B3mo+llamar+privado+en+iphonePDF link annotation
    • 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_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 10628 bytes
SHA-256: 4cdac1e87edb1bb6dede1b0487ae9ba988bce26dfc5835f9a8deab8b57730d71
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 19788 bytes
SHA-256: df0ef6ba254e1d0ce5b40362f5405e7f97bb4a60aca61a88bd2de27fe072a192
font_02_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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