Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ed9ce3bbe57c80…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 15:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c816cbf5cd1a2c6912e001045d971cb SHA-1: 325b79ab953621935f703dab07e8e196ffe921c8 SHA-256: 16ed9ce3bbe57c80f28b80f2daed6b3633e576f3d1aa8a02355549822ef6d5a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests it functions as a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=facebook+gaming+for+ios PDF link annotation
    • http://snp-ent.com/files/fckeditor/file/195368356613c13d482586.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/seluguwofomokenurodov.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/45778695273.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/84993654125.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145041c47599---tiwifomugefub.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/manemufadagereda.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/basebanap.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/72578784766.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/namofaragewokuk.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/49890791596.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/42787133589.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a38b09b6f---54645020334.pdfIn PDF document text
    • http://decorstore.eu/upload/file/xugore.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/63520939601.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ff434fac---penakana.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/23669719951.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6abaa1db---kadupotizabewipujakexu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/romepajorerebunogiki.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146285b7f370---bunagusafubin.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/28473754413.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/32046601767.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/fegak.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/faremijorimuroko.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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 10744 bytes
SHA-256: 478113500197ebfab49f4e012cf0979fd2964b2b3585708f9339ff7781960fd0
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 17252 bytes
SHA-256: d90dc85506be9f82fd66b69c086d653e71de07d9f7ff40c595eee028011bc80c

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