Malicious PDF — malware analysis report

Static analysis result for SHA-256 f395adee216c1fc4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 17:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8bbbedf67cff8da5999e43cdd669a5f SHA-1: 0260c7585ac2b0aa21c241ecbe6d84f9b666f611 SHA-256: f395adee216c1fc4095d857805bb2b3c973f9d6f643b12d13bbea70426779235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=harga+hp+samsung+dibawah+500+rb PDF link annotation
    • http://bephoangdung.vn/uploads/ckfinder/files/ludegifigetakote.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ce69e55e---biwejow.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/88389972943.pdfIn PDF document text
    • https://verner.lt/images/files/zonumezofez.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/laq31cdld9pdqq5ktnddbfqbvg/domenafijisatig.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/89351703901.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ulqlitr7001rk8ctis6kmle7lp/23545568903.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/42143873572.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/konupujisujitiwuvasoreve.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/88055805746.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210923_125604.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/24337261372.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/54979189932.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/batorov.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/5145710972.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613654197f05a---4255991228.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/56758328279.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/tudebomegedodeterotebuwu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/68828114537.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/lepojuropugon.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/37162327473.pdfIn PDF document text
    • https://tsolisp.com/files/file/36976038028.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/zikuruzevijabowuladita.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/vunuluzojusovon.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110023121227.pdfIn PDF document text
    • https://renetravel.ro/images/files/52693042869.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fuzedemopo.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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 16804 bytes
SHA-256: 8aac1e8798ab00f637b81db1ee16208242fcae23f2608c279c61cad771dfc9d0
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 11016 bytes
SHA-256: b42093f1c39d1611cc356980b9d5274defd6dc991d41167b566fe5fa7aa34924