Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b160065bde1b0c…

MALICIOUS

PDF

93.2 KB Created: 2021-09-19 11:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7dfe526203ac06c7dfa2a052d804b26 SHA-1: 9dfbe335f92a6af81a0a1b229d3f1336c2b32480 SHA-256: 55b160065bde1b0c80d3a2dcab6e4f0d2211a339e8f17425bed18b8b92ab022c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and potentially disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the PDF structure and heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=zip+code+villamor+pasay+city PDF link annotation
    • http://e-hematologica.com/users/file/86116093109.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/lunasibimuvomofafujit.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/finisinozefepifud.pdfIn PDF document text
    • http://scsytech.com/upload/files/fanatiligag.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/44733800255.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/42000955576.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/74472970600.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/39154265138.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/vovuzoluxomimomasazapen.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/18020000447.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/26821160884.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sigaf.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/44440004198.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3aadd6c8d1ddfb971ec81db2c587e2ee/rapimagomibalexu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/zifepelafesuzaw.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/77657691767.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/48794954913.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614643789199a---27727257192.pdfPDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6padqp8essbiqu4c3p0o4pkl3h/vokijuvepedokowu.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/joritibojawenulu.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/xelojoraru.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a088aa767---19998617286.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/19043877660.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_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10712 bytes
SHA-256: c70fc983918944c1bbb9f56f624de2271526e72a28ec1b958eedbd3b8ef2c68b
font_01_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 17952 bytes
SHA-256: 70c74ab0ca05be0f6f5959aae247be0d908019f29e2c69789f8c39d3792add7a
font_02_sfnt_off00014f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1