Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfc943d5f7de665…

MALICIOUS

PDF

81.2 KB Created: 2021-08-15 01:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf457c3b07af3e4a5df9da06fdd7bc43 SHA-1: 9d76f882f778d1ea9551d91c5b7409657b2b53ac SHA-256: adfc943d5f7de665ce57861fa79724a38bc259ebee7d652afca36ba15e334c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary function is to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=how+to+program+a+challenger+garage+door+opener PDF link annotation
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/0510ec17f0b24ab51cd8059ec9e83511/ropagoxawirigaromof.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07f979ef5230e3eff85ae2edb0d804dd/50396438834.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bce3f3726---rofimudikuzifafavofalerib.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/manozixiraxobumozujeko.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/77342750286.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210704065819.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3736eee079---52678219039.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zowejij.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/42578290336.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390e24d55f---linolujaxumegevutaga.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210530124512.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/bilalejunofalunemav.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/58535641415.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/49091355142.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb1775a9a---43214458069.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/komunuxirivabunibaga.pdfIn PDF document text
    • http://brenderup.ro/mm/file/53259701619.pdfIn PDF document text
    • https://stotex.rs//files/xidelasapot.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/9275929328.pdfIn PDF document text
    • https://schmitz.cz/res/file/33861664560.pdfIn PDF document text
    • http://adveotec.com/img/file/25667552902.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/kimiguxovalilavakoli.pdfIn PDF document text
    • http://akademibt.com/resimler/files/fifag.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f9a1cd36480ecf17ce5c54d61fa4ad2d/59655893895.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/bemazejazeladi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/27128223911.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/11317271189.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 10776 bytes
SHA-256: 16f47b33ec8b3714405606216dfe52bed9b7a6aa7945011ff888aab6e8cbbeb0
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16556 bytes
SHA-256: 729cc1e7fccd0be0160d6fc05845c7ec9295fee55bc6c33b32861c17f5ca0ed3

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