Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceee195132e8113…

MALICIOUS

PDF

68.5 KB Created: 2021-09-15 17:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39f1ed7320cc7773417b9a8577d3fe68 SHA-1: d659d5171399de6a843dcae8d022f05e1876b73a SHA-256: 3ceee195132e8113296ebc213f9dd681110bffb2167943678ddd446c80610294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards a common attack pattern of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=android+font+pack+download PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d90c973a80---75739792881.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/bovunalawinezod.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/tevufuj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec94aa955.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c78bbed1c---sukunofavisawidufakuvev.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/96130331308.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/79892580195.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/25991748937.pdfIn PDF document text
    • https://comfort8889.com/upload/files/4440433368.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/vudakovaboxenebijure.pdfIn PDF document text
    • http://esistore.be/userfiles/file/22722137454.pdfIn PDF document text
    • http://sql110.com/pic/31760712294.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/95741902260.pdfIn PDF document text
    • http://futboltotal.net/images/files/19319000414.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/97094307527.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/13875428797.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/pevodekawarufixojali.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/selajufexerenotujota.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/21368447037.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/21142735936136ca7c12592.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/97164501119.pdfIn PDF document text
    • http://lex.tj/img/file/66120615829.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/vinakezofoxexebixu.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/wopede.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/7450750439.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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 14460 bytes
SHA-256: 74da38a6627c94a7c2dcf22cee7c75349c4024dacf6732cdc072b772190a3e97
font_01_sfnt_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 10472 bytes
SHA-256: 2f87e686cc99e593d99030e43282c1bf13e22618b3d0a95b977a498a3d267b5c
font_02_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1