Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce79fe5482490f16…

MALICIOUS

PDF

91.2 KB Created: 2021-09-15 11:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ce03476f677d783eb3cbfd203036967 SHA-1: e066000658c695022bacda07ed05f3d181066330 SHA-256: ce79fe5482490f169e3f9635fde476bcde6ffe631b3dfa750a66b465fa3cb507
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious or phishing sites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://krisoc.ru/uplcv?utm_term=mod+apk+stickman+warriors+super+dragon+shadow+fight PDF link annotation
    • http://hightopeducation.com/cms_uploaded/file/99486516300.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/maminidumojanewid.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/44075547561.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/38002543793.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/43626667981.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/5527206082.pdfIn PDF document text
    • http://www.moyekolodin.com/files/siparereban.pdfIn PDF document text
    • http://e-menu.hu/editor_up/wuwagadotomakopagovukuw.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/50841443290.pdfIn PDF document text
    • http://futboltotal.net/images/files/54480402207.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/kokanibinimujetokuku.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/48656735501.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/7002308676.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/55830084055.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16141419e436ec---23918663467.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/25206944565.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/30887758240.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/dewixob.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/42051935940.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/8165342075.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/wilowotiz.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1dc478d2---70035482138.pdfIn PDF document text
    • http://citty.org/images/uploads/file/jalekatowopafotorewi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 21420 bytes
SHA-256: 3059868a80d0f062b4d79fdbd437a0dce826b4476ab824a087cf5e4eaf18609e
font_01_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 11292 bytes
SHA-256: c7383a03b1a3d0f1a146b537ea8fb7d393ca08372e4ed43209ceb429b9d3c451
font_03_sfnt_off000147d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D1 16384 bytes
SHA-256: b5cba810ccacd47bd6dfe858c2b1274c49fc2e3fc3ae529cbb14c80a65ff9de5

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