Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c4f3ed0159a181…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 22:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06b914ee7fdf7ffed65d80981cefc2d7 SHA-1: 355868c35981658f5590455b08b29be99416b575 SHA-256: 44c4f3ed0159a18149e4da1c8677a15c8fed59ff6f420d9718215c7a903af294
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs hosted on compromised WordPress sites, which in turn serve further PDF documents. This suggests an attempt to chain exploits or deliver phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9746301b---litubetilikotufidabem.pdf In PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/bafasikexodenogew.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/juzabizadaxipopeti.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/vosegeroxako.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/boniwo.pdfIn PDF document text
    • https://isleo.com/i_photos/file/winisifaw.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495517b0d92---fojodixixunewusimalamit.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/29963737895.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/wagaporofilixi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/76572232685.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/4313806976.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/43561866270.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/dozusolisi.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/wabudekesafifafeguluzero.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fepisuvotafibal.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/96198791689.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/52095821218.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/79909161527.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/94668067809.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/karometedavodowugewipegi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/widunakonuvematuleriti.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/322e14d22903e2431df06c3fbd6300bc/ganogodof.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/69310401107.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/34945906503.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xikakozuzezolebosamesoxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what%27s+the+best+gun+in+pubg+mobilePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kexotifevomexagigu.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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 15452 bytes
SHA-256: 754b9213740ddb9c0315de19fae0e06be071f23894a54d67b5d477a7e1e9fc19
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10868 bytes
SHA-256: 5484df3e29b6c2a6af2f985259f0081827f514a6b1a0410c3241a8655d04de18
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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