Malicious PDF — malware analysis report

Static analysis result for SHA-256 146bdf99ffad2628…

MALICIOUS

PDF

85.9 KB Created: 2021-08-19 03:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f87afe551a2b8f4ba15f592bb150ccb SHA-1: 75df5bac3ceb1a8f9962f6a2d305a043021d20ea SHA-256: 146bdf99ffad2628104cd365226c33f5013852947c5394bfe47c2697b1a05066
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be exploited, leading to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://baigeleather.com/userfiles/file/sifumugatasaronavuw.pdf In PDF document text
    • https://kanalprofi.at/UserFiles/file/suwevojefurevavejatofi.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/33369522270.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e484a879e81ef9912d9726340a6a5613/29936451762.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba5a2f7aa---fegike.pdfIn PDF document text
    • http://cloverdiamond.com/file/42245953582.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/67736814497.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7b293b48ad9ab2362a1c0ad9144837bb/vanewo.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/21709677332.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/42746095386.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/lerutelakor.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ig3u5lsj4t9to67mlav2sjfkib/25992178915.pdfIn PDF document text
    • http://4appsoftware.it/file/78380521061.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0bd4e2b2e---wuzutaxam.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb165fe3b667f047665893b13f04228b/xemutuvabi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160aea66103bf4---67708137096.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160add30bcea51---14236119276.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zimufifipisusapofoju.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/zaxeruxugofiwazerusuviru.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/60036135162.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gulukowopasax.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lp0gjgsjpsdtr2b68hm66ocptk/72023778553.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/06f6403ae11b722af997818386c0da5d/18282071813.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/95935882459.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b583171834d---timipoxegafegejitibobine.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa89985ad21---34274965883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+a+3m+filtrete+thermostatPDF 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_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10624 bytes
SHA-256: 0d2b9ae6e735d172ed4fbd95dd47b97a201ff8fa5cefaf4ff9fa30fa08a9358d
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 17344 bytes
SHA-256: eec9ae20e5673ef0515a0d6fe01c37d65e10efbc2c695da84e2bce08abe10477
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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