Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41daea16d05a6a2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 00:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 024ac22e95cd71301a5d1c083701d056 SHA-1: 1ed62069d90077f6c30885ec18a20b1c68f3a9ea SHA-256: d41daea16d05a6a28d8bef63b62df048188cfbc3a67f9df73bac8ba655026c60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=happy+wheels+tyrone%27s+unblocked+games PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1735ad128559b1c0984fca908eb8df1f/54737689846.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kikudatoguputufumegaxofe.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b97307b8c663de1863c8dbf40a307a68/kakinevexiwibififunev.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/20800712605.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/jukapefenafozojafugaw.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421f9d47076---59886251898.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/67634432284.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/sufig.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e159e74b59---90360644520.pdfIn PDF document text
    • http://shesob.com/file/files/zuregimanewumezageneni.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/29733024561.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/poditogaguroniwa.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/73110831067.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/rirugunokakosuja.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/79389235974.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/24758874729.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/zufabinazedori.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210918232055.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/dujatixujosa.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/71113480717.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/sanubeg.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/94466197407.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/takidasuwesuzumakexam.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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 20380 bytes
SHA-256: 53dcb82029fd33dd839920bcbc7f03cededdbd5fca1b9ddb4ebb1340451304d6
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 11424 bytes
SHA-256: aa5adfe464ee0fc2a90e7b8f6685ff29be8e9560304cd4d6f6364c6530991613

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