Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76c9953fb0c6889…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 23:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 256da78474f94f87beed31c44020cbea SHA-1: 277075727294acb78b2c12df400f05e42103e071 SHA-256: e76c9953fb0c6889873b7eb2850457108df57a7d671e0a3c3d4121a9628e15f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings clearly indicate the presence of external links designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/25943422956.pdf In PDF document text
    • http://wanyuantemple.tw/userfiles/file/4413915039.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/90289537956.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/pigadofap.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/kudofogeverufutogij.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614113ab68d51---92092792114.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/lazomepobegusotejerula.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/66163742602.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/39205625564.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/poxojafodibuwabi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f58a46477---24397210525.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/gakunu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/55904986333.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e590477d729d9904fae7cdb970affe0e/80166613681.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/vajedugavarabojewap.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/17340784393.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67643104280.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109150531016366.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/6026659502.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/tubupetukasimosiginuke.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/getufivarejo.pdfIn PDF document text
    • http://bronia.org/userfiles/file/36419525262.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xorusodesewera.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/tafolovizuzuzarukenexenuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=let+it+snow+2020+watch+onlinePDF 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_off0000c50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50E 17768 bytes
SHA-256: 657ee400f3236ace40ec85bc4a43eba8f76e72b6db28db52116c45671023817d
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10512 bytes
SHA-256: 68b704b0633e5368524eb3ef71953e341e05b20a3803d8ea82bf951976fdf922
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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