Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4b46df1ab93fe3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 14:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b05cb547e2c9caeafcaff9c4241722f SHA-1: 2222b28861bbe3209dce6dd2ab398a03f2c0e28e SHA-256: 2c4b46df1ab93fe3f5e05c6da64b4d1cf3d57534b24f1566ea190d6697cbc770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various URLs that host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or scam attempt, likely to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tenshinorchids.com/FCKeditor_upload/file/60530946691.pdf In PDF document text
    • https://vanphongphampmc.com/upload/files/zanaxekogegusanexusizo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/31731088876.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/11908950003.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bd154d4e---zeruroxivesedamefemogo.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/samolodupixekuxotexofek.pdfIn PDF document text
    • https://tsegypt.com/file/44570890737.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/73880549.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/79644657407.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16092ad291969e---pofavijonalebasijef.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95233565328.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/49397051980.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ffddb3f1---xekelosipiripupumezazi.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/visogegasufukavolivofa.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/32257o7cb5i9tv3vdr2hrsddq0/10387387509.pdfIn PDF document text
    • https://brukspec.pl/upload/file/zetolalebisaguvujib.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dd290964940a5764ca801368cae247f7/93344963772.pdfIn PDF document text
    • http://scantech3d.com/files/59514249242.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/blockcv2b2mf3le52biih6amo1/mupofobesufidilowub.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608900a8df3b4---sabefusej.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/dirudukimabarisebixa.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/pezazozu.pdfIn PDF document text
    • https://diphong.com/uploads/gutagukakamanamedubo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb33dd8c3---67066278394.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/eca2fffce2fbf85b617e0f7917ecadba/dudikixivodotul.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8388d28cb353888ddec1b1bffa2b46f1/57429346870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=remove+watermark+pdf+freePDF 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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10536 bytes
SHA-256: 55bd208c52c548dd23065f77ecd6996c36cbe546e66d825da9ced26058819fb9
font_02_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 17760 bytes
SHA-256: df33ca60573a50f1f6f2dc4ba23157dfca82f69b634afc730b62d274b0c34157

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