Malicious PDF — malware analysis report

Static analysis result for SHA-256 4409d3186feb9bf3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 01:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30a9b98db5deaf5c13fa9ecb028a4d8c SHA-1: 9255b021e3660c3f7ea1736185b9fa9536fc54f1 SHA-256: 4409d3186feb9bf3087e06ed83ce62c9c1710f6da5bf2fe8098faa7de66d6b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristic firings strongly suggest an intent to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73f42653---molunifipo.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/6kvlo02tbb1qasm2p0s0alf4r6/22870006669.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cefc3987f423ca14101aa85f5df4d3ef/69637952430.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770908d4010---bulofirunadubogexorinof.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674b81c031---josoviwalis.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fa944c05877c92ffc63d253d0b967367/vemibugamofuferuziruzu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/kojumugigadiwazojakew.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050813564264.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gcj772lonhntejnhb47329380r/27543574371.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///28294988278.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/81733018871.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210826_E10CFD815F88BF9A.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/wivuluzupadirunorebozan.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/janalisinumolegeg.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/8369672492.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/31e04ed83192bbb1de508cc016cef5d2/tenokikezimofipubatenopib.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/bufamodixonuvobuwukuki.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/ludoroxikogepenosirixime.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e5bfb5fcf48c461c519b910665c8f667/55352122056.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3433df0976---dofedibigopedi.pdfIn PDF document text
    • https://msvadba.ru/files/file/42766559879.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cbc3cad5d3d3395611d1c492149cec15/kujafugifetuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=estrategias+de+ense%C3%B1anza+para+preescolar+pdfPDF 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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 11044 bytes
SHA-256: bf1dece396bce0590cca3bf850368c8431d9f03ffa4bb99ce82174a424723fc7
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 19808 bytes
SHA-256: 66b04b8e7a00b04d1c1579dd3de771138a913167e69358f1b340a5188cd1ad34
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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