Malicious PDF — malware analysis report

Static analysis result for SHA-256 5682e3a8c57bdaae…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 17:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a6f973b0d3d1684fe79cfa6eaf4c0d0 SHA-1: 0bce0add7836124daf386cc64f14e980bf474a4e SHA-256: 5682e3a8c57bdaae7521265de3d26e53e56ecb4a9027a97e888de14d5bf501e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. Several heuristics indicate the presence of external URIs and link farms, with one pointing to a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=tools+android+development PDF link annotation
    • http://www.chubsorn.com/file/files/89343524232.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5312ca66---44069239004.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/mutevasuw.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/51209242240.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/2243263286.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/4105674978.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/niwexadifejunonazimasi.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/guxupijem.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/34749279350.pdfIn PDF document text
    • https://khanikango.in/file/batev.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/gopukot.pdfIn PDF document text
    • https://adikkedua.com/contents/files/52243392009.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/44686529183.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/bovosabojepajukuxokujub.pdfIn PDF document text
    • http://headrepublic.pl/images/files/59507381648.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/rusegijasisirigepeluj.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/sufanitisujokojaponinurip.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/dupagupuziwarodisagomij.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/71862848919.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/voxijavobipozavaxorod.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316aa28076d---95222395981.pdfIn PDF document text
    • http://alcantara.cz/data/file/56660810621.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210904100811.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161390a4f18626---86072933025.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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 17712 bytes
SHA-256: b5a5a67d7c2eb954071e48ca9a7446af02e8d3dac8007e34cbecc2d6600ad52d
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 10584 bytes
SHA-256: 9c8ccdf463751f04db177a7e79329ae9b3da42fddcef4c0e064735df5d41a200

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