Malicious PDF — malware analysis report

Static analysis result for SHA-256 15648dd8dcec39b2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 08:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b5c1d6aa28e2b9c527ea5c7d18c9503 SHA-1: a247863917e14fbb48021de698a12cb8fac5ae01 SHA-256: 15648dd8dcec39b20ac5764132990e43af4c5bd73a321cb87bb9bc18aa17242c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that appear to be compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a7b26da03cbd6a5a4cff66fa15b7cdce/75978212862.pdf In PDF document text
    • http://fullx.net/files/86871686418.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/womojomuzevitedatefiz.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340a855f345---xetepuwuweko.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/gurunuvepegenoriji.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/63489352794.pdfIn PDF document text
    • https://venus-forever.com/image/files/xofewibafupoperomuzavuba.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wiruguzoduxojonov.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/tiwegenapiva.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/wosezoxenatokaxogirufute.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/89870883693.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zotalovafodelepotuju.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xavozaleximelugenaxuv.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5648a0a9---19310180622.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/desereluvorepanojizifu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bpq9c29p0t0olgn9n3iojlipko/jugakevusofelikelawabori.pdfIn PDF document text
    • https://bdata.vn/upload/files/42107480557.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/90bc6ab57fd73d60770b2b54470cf9aa/79609140282.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zabunejigejonanon.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/8368293362.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/zonoturunek.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/30319882062.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/warebudajetajukasewi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140840b953aa---gawilosezuwonebower.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+madea+christmas+play+full+moviePDF 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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 17800 bytes
SHA-256: efd923c9aa54c2e47c8d37a583d10ebaca76edfc76e9ba6c71655ef9332e5845
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 11044 bytes
SHA-256: 52e080a470faabd19e2eb9f6dc1a62b326107c3101668c1993aae9f415e9b05a
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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