Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c54df6b189076c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 13:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e43e70fd924f4e38915b90d1e65ad23 SHA-1: bde2fda3b45e6799cc576e9b71c85f4e0aca5346 SHA-256: f1c54df6b189076c2d30046aae88c45fbd0122d4ba0e499f959f12ab29efcea1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous external URIs and link farm heuristics suggests the document is designed to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=panasonic+eneloop+battery+charger+manual PDF link annotation
    • https://www.opsclown.it/ckfinder/userfiles/files/mekanuzadubuja.pdfIn PDF document text
    • http://huefpdf.org/upload/file/18724292179.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2844d8507d53f8e32082f61eb677c15b/doroluba.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kulemumovitedejebilonase.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab1071780---fomijasatan.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1de620e6a---foterukemekufux.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c10e14fd2138a263f02311b36f19fe9f/xavuwumafo.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/fotesopopunojusabafule.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085170acb059---vepesijefa.pdfIn PDF document text
    • http://mariancozma.com/_user/file/gumirugolotavipubugobibo.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/wujuxovakawagozomomonun.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/47782766543.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/24330091388.pdfIn PDF document text
    • http://mp-journal.com/media/file/14348977778.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9bb2f36383afcc84b9811e90e67a87d1/wewufebisexutedov.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/531a8480aeea0e31f62abf7e0672e3b6/16826256419.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/lifaburatedam.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/53688242701.pdfIn PDF document text
    • http://feminella.ro/upload/fck/63739430408.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fusapajukavawixes.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b3cd86f4---49109070002.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/24366026012.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/46979007282.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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 11176 bytes
SHA-256: 898fbb09683b98d5307ce266b9d943586096db7e0162e86592bf946d3c9a42b9
font_02_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 20760 bytes
SHA-256: b6c1c076bf0f363201ff0d450d83312498e61a9265ebab013727f126d9f96027

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