Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc9dbe777631e20…

MALICIOUS

PDF

101.5 KB Created: 2021-09-18 23:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a43a96b2810e8b71f55df6d2e09ab69 SHA-1: 591edf68225d4ee7f7d6e56d48c509b4e4d15786 SHA-256: 7fc9dbe777631e20563372bba2cbd85a837a5742958466abb40f70097aebbee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of external URI heuristics and link farm indicators further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://oniceh.ru/uplcv?utm_term=year+9+end+of+year+maths+test PDF link annotation
    • http://yalcinsezer.com/upload/ckfinder/files/53823371059.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/bibigulaxorebumokutokeme.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xapuzobafimifinosivugo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130d286e80d4---96387439167.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/3851517560.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d52cef71---xetomoravozaj.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/48701014680.pdfIn PDF document text
    • http://cl-pub.com/files/files/53551076760.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/28952aa1a2403d0f2c7af9bb393b0a96/gibewu.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/15244920619.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/97597373427.pdfIn PDF document text
    • http://js-space.de/userfiles/file/19067800965.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/24054844711.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/bufasurigazidizire.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/83179160014.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/pitixejigegevukagejiw.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/25621334199.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/towesetowakojemumif.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jipoforafaneluxomidodo.pdfIn PDF document text
    • http://yoron.net/up/files/xupunijutuwute.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/kegad.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/76595391385.pdfIn PDF document text
    • https://rcot.org/userfiles/file/gemotugu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd97a293117357a8f5cdb12f5c1ac02d/34143828439.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/feporifigunudozowuj.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/parorowo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/vvbf61tk11git6igm1ee2g5jf2/98902934732.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_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 10748 bytes
SHA-256: 737ac5b010a59cbafd2f8282cf3fb73088cd1f4f26d588c4ed812e2de333194a
font_01_sfnt_off00013bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15400 19876 bytes
SHA-256: 61786714df99289e6fde23654c343a2fc8d4d59e90813c9afaf48221266511a7

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