Malicious PDF — malware analysis report

Static analysis result for SHA-256 024ea3a68ddff0ee…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 02:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9afad0c70d32732d1f2ce6be69ef304f SHA-1: b3137b1c65e78ef908a94aeb184c29a302d7301f SHA-256: 024ea3a68ddff0ee89d937f687787ae3753fea9c2ddc0c67a6a1a2cc44722090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://olympicwroclaw.pl/zdjecia/fck/file/suvaretab.pdf In PDF document text
    • https://latrinquette.com/upload/editor/file/rewoxoj.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/dajovadiveripa.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/27802610628.pdfIn PDF document text
    • http://kant21.com/userData/board/file/50591174194.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/tezuj.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/rumebalivupazofifumenel.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/26efcac1c8d770c179f178857b95caee/sabejafonajidis.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/53518990687.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/dizogaxeribebuxematel.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/derafenuru.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/3640946497.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/78298993901.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xofudosedebex.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jenivevomumix.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/63585005960.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/62004644349.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/nurakib.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/gisemufosas.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/92318146259.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091617020499.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f92676c2c---9932378862.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/sewofirijebegitusuxebiwem.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac013130e7---78752073843.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dexogulozedezurojixiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=speedometer+android+appsPDF 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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 10584 bytes
SHA-256: 3914ff7dd5d4658fa61ec9be89f38621b55fb4d89dccefff110d00c99816264f
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 17368 bytes
SHA-256: ad49fa13e3ead432c0137f13b4d2ba2cf0ad464d98be749f39c909ebfc566332

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