Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a839983b197d19e…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 01:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4258852d11d71cd81fede20f831ace1 SHA-1: ded79f6008c43d8a758b5ce25f2bf77c7bb4c67a SHA-256: 2a839983b197d19e0931529399fdedd415e362d4af819fcd64c3b248e0b0d818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware distribution campaigns.

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://aadhaarretail.com/administrator/imagetemp/file/xaxufobipisavopotuzi.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/calctfjl16mq84es3a2nenrl01/77013620872.pdfIn PDF document text
    • https://tonitomov.com/picture/file/futofaruligigiwajaxi.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7196ae698769beef8d10498a3120f382/xolikasibebiponebepor.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/xisejovorukojamexul.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/72238881544.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c2b21c94d---66400018791.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/55304300609.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf61c333e---nobidalorogasexopuzifisu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/41208596286.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tafogefigogigakuranez.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/45909780827.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/rusovirifamisir.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b582dcabb556e6c5ec497ce80bfdc26f/lewosipa.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/nuwifawevekeda.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8503123358.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/75805095245.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/rekiworokatosifosev.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114d26c9f7af---vutulakexasafukomem.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/pamukarizofi.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/96348530762.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2d6bdb6ccb9748f779a61c40c9523cef/38234459451.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/50903136317.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096893d91e21---woredakufasakexo.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/98611729238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=o+que+foi+a+bolha+imobiliaria+nos+estados+unidosPDF 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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 11028 bytes
SHA-256: 5f7cf734d98cacdc5651743a4edea2cdbf874c779267def00b43bff36c9d11bc
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 18968 bytes
SHA-256: bf4d77d261477bc35ed2bee83b3833968bf2a3268bde47e1a338ca804fa15377

Open this report in the interactive analyzer, or submit your own file for analysis.