Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd62a28bf90dfe6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 11:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 685bed7cdba38666c9d6bfc77446b32e SHA-1: efc7b7b6e624674542cb9c18cf51efb5a8c9f4c7 SHA-256: cfd62a28bf90dfe605aa388355ab5a5c8f0b47ef4f660c9d470f1889e6bbbac1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=yacine+tv+apk+latest+version PDF link annotation
    • https://angelsstaff.com/uploads/file/19791324249.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/kitokijogorak.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/sudasazukeponedu.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/82239028130.pdfIn PDF document text
    • http://dsfly.com/uploads/files/27316169352.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/dutetuwadiwenukegime.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fopubif.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916041930.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/74675540749.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/11317792494.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/fubexeraliwunegizopu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332aa0fb8a---94101839561.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/24722678970.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7937ecd507b0965ff28a979428d76e46/potozazoraranowitolemis.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/50621729806.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///89174403075.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/22765088071.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/badejul.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/30974046686.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_86A8E8F56A817D2B.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee27de10e---99845794752.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/wigirawivewavisu.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10508 bytes
SHA-256: 216e2877806c90ab7ba85dd2e8479fc337251675ce9053f789fc95878e37e9e9
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 17000 bytes
SHA-256: 0866b55442a20ef82b7b9a1030d18d215aee6ea2bb420e7c0cc8453212140807

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