Malicious PDF — malware analysis report

Static analysis result for SHA-256 8880922ae0e0dc57…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 20:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05a63f74e5054891860e08dd219f01ec SHA-1: 63638d4edad200162c20c005ba4c3721e7752c3b SHA-256: 8880922ae0e0dc57fb9f0893e2647eb3e63e1eba18bd9b3d68bc923820f41952
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://orosweb.hu/userfiles/file/33366331865.pdf In PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/xaraju.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/5909099546.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/33120097084.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/miwefometojonikudikoli.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/49592881167.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/12684084568.pdfIn PDF document text
    • http://isgsrl.it/images/file/52673533920.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/penumiteleza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146aee0962---guzuwojudog.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/zogorojigoruwawelodedepul.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/86941489334.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fesedomodazusux.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/zularesofipabiwi.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/soximezugipaguxejuxorujez.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/95354894645.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/vajigexatolokizijisibotuz.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/81094409677.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/wakuzulurosub.pdfIn PDF document text
    • https://ancoraeducacion.com/images/gigoxodapibofiru.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/ligutudanujatobexurifu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f315fb3d465913c058b27628ec142542/70639677002.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///46384760465.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7d9eef9c---96115142124.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/zugiramudijiwulewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+walking+dead+season+2+all+episodes+apkPDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 10732 bytes
SHA-256: 7e224ade245d15b2e9c4ea8d5b9d31c5d5cdc6e9dc03386ab4bc70ac6a19935c
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 19540 bytes
SHA-256: 1c0e31c8044150a4110d7579c89956da5d3fa7699d2daff7571fb5812d311073

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